Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ae6b478e39710b…

MALICIOUS

PDF

38.1 KB Created: 2020-08-12 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae9f9db3999ff37ff0d1f0d40da685d0 SHA-1: 6d1c4090b1926eb36f2ab377bb906e7ab125b2ae SHA-256: 73ae6b478e39710bdc56d0c47a1efbb78f32799492d3983cf3125b0eb10695e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=cambridge+igcse+computer+science+programming+book+pdf', which is presented within the document body alongside other links to PDF files. This suggests a link farm or redirection scheme designed to lead users to malicious content, likely disguised as academic resources.

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.ru/pify?keyword=cambridge+igcse+computer+science+programming+book+pdf
    • http://files.fsev.fr/uploads/1/3/1/4/131452952/desuvufalaj.pdf
    • http://files.derekdturner.com/uploads/1/3/2/8/132815791/jifubalamilopen_tidojifuzor_nimixuduwideb_rerumijo.pdf
    • http://kifudor.brushworxstudio.com/uploads/1/3/1/6/131636664/1815432.pdf
    • http://files.lonnybeharmd.com/uploads/1/3/2/3/132302859/dacb25108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/nogalixizodafuwabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0918/7750/files/14136723083.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4293/files/tepora.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/what_is_unicast_multicast_and_broadcast_in_networking.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/13695694925.pdf
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/tesoxagajuvokobofupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/solizo.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/manual_drip_coffeemaker.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7879/files/d_d_dungeon_master_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/66072554084.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/zigatukinipasopevodibegij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004869.bin
e45bbc43f4fa79224497834116d837bee6443e07064d69f673c0f789ca540498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4869 5552 bytes
font_01_sfnt_off00005b39.bin
9207532cf202d5e0a9da640a34486fd81543a49fae0443e03bc4f94d5467c315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B39 9784 bytes
font_02_sfnt_off00007cc1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 4324 bytes

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