Malicious PDF — malware analysis report

Static analysis result for SHA-256 e103cf1c857932c8…

MALICIOUS

PDF

38.5 KB Created: 2020-08-08 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0bf54f27ed723741cd57bd8024967b5a SHA-1: 575c4863e57de7d445cb3343b0d945a9bc9a4a42 SHA-256: e103cf1c857932c80bee502e28a05d70682b116f30ac95cd1cf63835b27698f1
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of numerous links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=meio+ambiente+e+sustentabilidade+andre+henrique+rosa+pdf In PDF document text
    • http://files.halonades.com/uploads/1/3/2/6/132681910/jizekomu.pdfIn PDF document text
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdfIn PDF document text
    • http://files.auntiemaileshawaiiangourmetfavorites.com/uploads/1/3/1/0/131070651/8236876.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/1/0438/3434/3574/files/3958844582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6936/4632/files/13750_cerfa_05.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/persuasive_advertisement_examples_for_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/centrifugal_pump_curve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/57650291473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/surevibujaxolofabuwik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/lebedomoluta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/pavad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tusag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3207/3624/files/clipsal_iconic_catalogue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4780/3287/files/asma_2020_pediatria.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53C5 5552 bytes
SHA-256: 5833aed25962037a1cd702b1da664a9932af2b48bf1d2caa48162aebae4a2d48
font_01_sfnt_off00006674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6674 11976 bytes
SHA-256: c1bd550e33722b0a3ca71daacabad69d34bae967919c5e0c3e4cf5d24393d933