Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc1051e877dad50…

MALICIOUS

PDF

49.4 KB Created: 2020-08-04 10:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368cb55e83b5821b7086994182734ad3 SHA-1: e46a89b5a194e4cf434078cf3e02bea89245a8d7 SHA-256: 4fc1051e877dad50ca6986cadc5c4a002c7fe61ead9adc1c4bd4844eafcfc083
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a suspicious one pointing to 'ttraff.ru', which is known malicious redirector infrastructure. The presence of a large number of links suggests an attempt to distribute malicious content or phish users.

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=stochastic+oscillator+pdf
    • http://files.mississippidistrictexchange.com/uploads/1/3/0/7/130740443/71610fe2c23.pdf
    • http://files.shawfamilywellness.com/uploads/1/3/1/6/131637529/fd063c556a67f52.pdf
    • http://files.stephparisi.com/uploads/1/3/1/0/131071167/gekolupodu_pifekukefaza_pazojap_besisur.pdf
    • http://files.awakenoneness.com/uploads/1/3/0/7/130775712/linosuxipijeke.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/3579502643.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/canterbury_tales_old_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/vewenovavalisivupezos.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/21415405729.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/farotobirifurikimoxudi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5526/files/77325507496.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/attestation_d_hbergement_parent.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/77749653286.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/nhie_home_inspection_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/77207505076.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/gifedipatizebinufigiro.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000612f.bin
7695d2aadd954cb07c866b29795ed76703d7727a4704568708274ff66a266b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 4908 bytes
font_01_sfnt_off000071d9.bin
2630e1c72d6094429f18b9a311c4aeff99f3dec79803bdb8aec47adda6c379c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 10376 bytes
font_02_sfnt_off00009573.bin
275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 16112 bytes
font_03_sfnt_off0000aa42.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA42 4324 bytes

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