Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d270d16560550c…

MALICIOUS

PDF

57.1 KB Created: 2020-08-11 08:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0159284b4df2f002b9c8f2f2e06552d SHA-1: 766006e4e8ae23faf153e7ca2e362352d85da627 SHA-256: 16d270d16560550ca2ed7627883c6bf0d182bf3175279302840ed99e4e9d0bd2
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one that redirects through known malicious infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure for a PDF document, and the presence of embedded URLs strongly suggests an attempt to redirect the user to malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=historia+de+la+administracion+en+la+epoca+primitiva+pdf
    • http://files.shutterbunny.info/uploads/1/3/1/3/131383586/6834229.pdf
    • http://files.hollyspoodles.com/uploads/1/3/2/6/132695455/lejekenogefa-zusonadijo-bigizexisijod-penomuk.pdf
    • http://files.mmac.org/uploads/1/3/1/8/131856907/tifajesusi_nemal_surolinaxarefef.pdf
    • http://files.flawlessreflectionsautodetailing.com/uploads/1/3/1/4/131437756/4025e4268.pdf
    • http://files.israquakids.com/uploads/1/3/1/8/131871466/nuvituluni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/jilumalizav.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/3159767893.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/kojevijejujalu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/argentina_debt_restructuring.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/php_pretty_print_json.pdf
    • https://cdn.shopify.com/s/files/1/0433/6789/1094/files/pikufawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/sidejewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/junixofupela.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2163/files/filter_dictionary_python.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5229/files/tenokomafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/jisozal.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_off00009ee2.bin
fdb4f3124acd137e8d0f9957d2cbc1f4618ffecdd9803ce7dd866ed421803fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE2 5324 bytes
font_01_sfnt_off0000b0e3.bin
375f39e1939ca8a0e60ae975b52214b01d54dae432d5a354082c75cf34eb0bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E3 11168 bytes

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