Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c79b264177bac1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-05 14:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2a4b4a949541d2d1b1a3fd264f0d44 SHA-1: 9466ce224cb084946dee8631717a4c7fc900a8e7 SHA-256: 61c79b264177bac1dc1a2059b27c527ef1dbc406ef9172ca7ccb22e225c7b3a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though malformed, contains a URL that appears to be the primary lure. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to obscure the malicious intent.

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.com/pify?keyword=formulacion+quimica+inorganica+ejercicios+resueltos+pdf
    • http://files.transformedbymercy.net/uploads/1/3/1/8/131856290/afcc75dfba5bb7.pdf
    • http://files.texascenterforregionalstudies.net/uploads/1/3/1/8/131856381/29afc.pdf
    • http://files.limitedrangearrangements.com/uploads/1/3/1/0/131071167/zowasej_fewafokokuni_maxijopap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/pradhan_mantri_awas_yojana_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0536/files/zuxexes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/78011367385.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/lajofemokobejusela.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/99494734086.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/16216854991.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/wusumil.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/7879196247.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/luxidefawuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/wilunewaberipe.pdf
    • https://cdn.shopify.com/s/files/1/0441/2299/6888/files/kabobobozelakaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/sosuwuxowewemerivulob.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/39146654825.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e7.bin
8bb05b4047d754213f43e6497ae3815b27a113c5f26aa1a4fc31320310ef9623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E7 5512 bytes
font_01_sfnt_off00006480.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 1800 bytes
font_02_sfnt_off00006d0e.bin
b38b7c4a93f1fa55f8862a70d5c7c5e3b0782366e4394e50edcc11c968120608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0E 10604 bytes
font_03_sfnt_off00008fb3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB3 4324 bytes

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