Malicious PDF — malware analysis report

Static analysis result for SHA-256 1274bbb1fb7c4740…

MALICIOUS

PDF

44.9 KB Created: 2020-08-04 16:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29fa52740575453347b1b37bc724c1dc SHA-1: e941386274fe23f6810cea7b0653ad4137c8b4ce SHA-256: 1274bbb1fb7c47403739d9c4c01592752c31fed987e34e6a7f76c09f226a8ec2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier and contains numerous embedded links, many of which point to SEO spam or a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are also present in the embedded link list, suggesting a coordinated effort to drive traffic to malicious infrastructure. The primary goal appears to be SEO manipulation and redirection to potentially harmful sites.

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=concepts+of+networking+pdf
    • http://files.withlovefarah.com/uploads/1/3/1/8/131871744/cb54569fe26.pdf
    • http://files.tankuanaw.com/uploads/1/3/1/3/131379612/eda4253071.pdf
    • http://files.wellbeankidsyoga.com/uploads/1/3/1/4/131408209/1375672.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/minecraft_server_unable_to_access_jarfile.pdf
    • https://cdn.shopify.com/s/files/1/0434/8506/9478/files/naruto_shippuden_movie_6_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/mozelozomugavumafotoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/7538672801.pdf
    • https://cdn.shopify.com/s/files/1/0436/6182/0054/files/66182913030.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/medimud.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/nitudexufawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/sovemonupilumepes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/summary_writing_exercises_with_answers_igcse.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/fovajas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zawitowawipujeko.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007213.bin
d3bfab9e41b9763e01b9f6725e809821ed354266703a6edcd4100dffb64a953b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7213 5144 bytes
font_01_sfnt_off000083ba.bin
36e2faaed3ba11dc3e61fa73cbaf617df64fa3351f4417c8073937bddb384917
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BA 10180 bytes