Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b153e1aa18a589…

MALICIOUS

PDF

44.2 KB Created: 2020-08-16 23:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8ff1b8231704d884a9f2bdf09e2da8 SHA-1: ae9551feb58fbefe4e95cbf77b89b9df1e9948d4 SHA-256: 62b153e1aa18a5894660dc0c322847626589e66a79d1897b1f07ab65ca25135d
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to external PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure.

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=format+sql+query+in+notepad%252B%252B
    • http://vagegoj.knightsofmotorhoming.com/uploads/1/3/0/7/130775540/8047844.pdf
    • http://files.lmbrowsandbeauty.com/uploads/1/3/1/4/131452949/2bbc5c05d8ec48.pdf
    • http://wujemuzez.disabsdimes.com/uploads/1/3/2/6/132681422/5639903.pdf
    • http://wuwif.swampfest.ca/uploads/1/3/2/8/132814930/84fef61070b13d.pdf
    • http://luvimega.caked.love/uploads/1/3/1/6/131637136/rozowejut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/59781222968.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4328/files/3091953003.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/kofujawurosusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/78027441218.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/84425218566.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/lcci_level_2_question_and_answer_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/99219121295.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/27603598064.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/43474560753.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3873/files/58511588681.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/lecture_notes_on_abstract_algebra_groups.pdf
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/baixar_free_to_word_converter.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/burorumazujeverufoliwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/jekerakufofo.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_off00006458.bin
9ca9634203bfe2974093b340786017f411983b0eb6eff723fa03a8a2d6ae5615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 5288 bytes
font_01_sfnt_off0000763b.bin
d8a22b23be0ce749918396501478e9c06c9de83373fc6fb60c602c36cc2adb3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763B 11072 bytes
font_02_sfnt_off00009bfd.bin
e51ca0148e7e0aae4eb42a5f75a65a08a0f66e9857e45ec5485c6aa46bc5905c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFD 1740 bytes

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