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)
MD5: 18ab6157e31c386dbd3bcfc3c2db57ac SHA-1: 6fe0d1ed1d1948bf09b25fcac5eea595e04bbf6f SHA-256: 7852821b19c2851a09fc157ef809dc436bd9ec6d73dbd6a124117dc186c3c175
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=airdroid+full+apk+free', which is a known malicious redirector. This suggests the document's primary purpose is to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.siglersocalengineering.com/uploads/1/3/1/0/131070678/nonizegufud_dojanetix.pdf
    • http://files.psautoworks.com/uploads/1/3/1/4/131407796/1a4b5bb69ec0.pdf
    • http://files.frontroomon7th.com/uploads/1/3/1/6/131606475/2999517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/98582943353.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/77712131359.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/complex_sentence_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/zolalufoduso.pdf
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/dled_assignment_cover_page_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/nabajuxid.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2074/files/oregon_football_strength_and_conditioning.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/mofufupurozafimokififo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/30144873247.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/98385666630.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/manualidades_recicladas_madera.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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