Malicious PDF — malware analysis report

Static analysis result for SHA-256 877c4bef21af4bad…

MALICIOUS

PDF

44.5 KB Created: 2020-08-19 03:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 831dd5c39e093a563a52acea62703630 SHA-1: 0364e4f13eb6b88280011f958e1c318459f15dfe SHA-256: 877c4bef21af4bad7ca16634647dab5fec40dd40c68c2fe8c8c65ac58826c5c0
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=crosswords+with+friends+answers+10%252F+23%252F+19, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness.

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=crosswords+with+friends+answers+10%252F+23%252F+19
    • http://zokema.americanenglishsounds.net/uploads/1/3/0/7/130775085/5674627.pdf
    • http://files.postmaster-jobs.com/uploads/1/3/0/7/130738603/ae0eab6.pdf
    • http://files.fhva.org/uploads/1/3/1/4/131437308/wapukemog.pdf
    • http://pudafoxap.ashleyshellhause.com/uploads/1/3/1/3/131379179/1760127.pdf
    • http://rapimu.talinaperkins.com/uploads/1/3/2/8/132814038/6756890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/4403/1899/files/free_to_word_converter_software_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5765/files/12903399293.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/90371183803.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/bifadedafedijefaginogegix.pdf
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/44180805380.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/balagtasan_piyesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3421/4561/files/kilogudek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1297022614.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9511/files/benim_hocam_video_ders_notlar_eitim_bilimleri.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_off00006f01.bin
605e89a989a43c2e55687729a8dc4450947b70102212ee8ce032d993931f2974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F01 5644 bytes
font_01_sfnt_off0000823f.bin
42df337e1bba4ee1062a051755c6da335f5de77d8dd936f0179442516c8e661f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823F 10192 bytes

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