Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cf907a9986a55e…

MALICIOUS

PDF

72.3 KB Created: 2021-03-01 13:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f8d527d3d4108df1d0302cb723a81bd0 SHA-1: 89460c72f23f0cb6dd60dc3df89c87bd92e2b9d6 SHA-256: 63cf907a9986a55e09e30de337f6f7da513b2e6648bdfbe78dfba0b93fb10806
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure and heuristics suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=innamorati+a+milano In PDF document text
    • http://greatholl.com/tik_tok_play_store_karna_haih3mld.pdfIn PDF document text
    • http://frut-tree.site/jitomolajumunipeowfoi.pdfIn PDF document text
    • http://tumbaa.space/120737276hgsh.pdfIn PDF document text
    • https://duvigefotazepex.weebly.com/uploads/1/3/0/7/130775674/9780298.pdfIn PDF document text
    • http://salea.site/21942530048dy5o2.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/4635006.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/nozogogak.pdfIn PDF document text
    • http://wtia.space/bujewisodakuxodokwbxyk.pdfIn PDF document text
    • http://productwood.ru/kadibowowosebokilv4ci2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff33d9a9304a.pdfIn PDF document text
    • https://melinifijegor.weebly.com/uploads/1/3/4/2/134265386/zadimigezivoda.pdfIn PDF document text
    • http://rankingcoach-apps.com/evenflo_car_seat_safety_recallst0v15.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/loxurakitidu.pdfIn PDF document text
    • http://help-verification.com/katamimineseragadimano9t6gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/how_to_obtain_a_concealed_weapons_permit_in_south_carolina.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 4592 bytes
SHA-256: 1dca977f2d8ea16283b9bc5263022498e1e0420111fa99c8dafc1a3f25e9eb03
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10192 bytes
SHA-256: 38137c2b40aab05010dd6118b8ca69a8b4cb7a69267de3c30556c630877869ef

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