Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852821b19c2851a…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 09:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 18ab6157e31c386dbd3bcfc3c2db57ac SHA-1: 6fe0d1ed1d1948bf09b25fcac5eea595e04bbf6f SHA-256: 7852821b19c2851a09fc157ef809dc436bd9ec6d73dbd6a124117dc186c3c175
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) that is associated with malicious activity and SEO link farms. The document body explicitly mentions 'Airdroid full apk free' and includes the malicious redirector URL, indicating a phishing attempt to trick users into downloading malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=airdroid+full+apk+free In PDF document text
    • http://files.siglersocalengineering.com/uploads/1/3/1/0/131070678/nonizegufud_dojanetix.pdfIn PDF document text
    • http://files.psautoworks.com/uploads/1/3/1/4/131407796/1a4b5bb69ec0.pdfIn PDF document text
    • http://files.frontroomon7th.com/uploads/1/3/1/6/131606475/2999517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/98582943353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/77712131359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/complex_sentence_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/zolalufoduso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/dled_assignment_cover_page_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/nabajuxid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1464/2074/files/oregon_football_strength_and_conditioning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/mofufupurozafimokififo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/30144873247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/98385666630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/manualidades_recicladas_madera.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 4908 bytes
SHA-256: d6bb0b25db244a6f69eb30b5389876de7addf1655586e560e6e9d64a30b118c4
font_01_sfnt_off00007439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 10456 bytes
SHA-256: d080bb8cfc718a2b965fb102f1e531bafe7969db603cf31f3025f3743891070d
font_02_sfnt_off00009833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9833 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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