Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3d65d343895527…

MALICIOUS

PDF

58.7 KB Created: 2020-08-09 20:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9f7815e9075664576306d5d9e67b46 SHA-1: f2fe15d125f277d9d44b1064cbdc17ceda28702c SHA-256: 7a3d65d343895527c3b802c9655fb5cbc34035b0079e4a095bb6d803fbb59d42
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Shopify and appear to be part of a link farm designed to improve search engine rankings. One prominent link directs to a redirector URL, suggesting an attempt to obscure the final destination and potentially lead users to malicious content. The document body itself is heavily obfuscated and contains a URL that appears to be the primary lure.

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=autocad+3d+basic+commands+pdf
    • http://files.aiwonglawyers-en.com/uploads/1/3/1/3/131397996/df23e2.pdf
    • http://files.lafayetterealestatehomes.com/uploads/1/3/0/9/130968950/097a7521910ba9.pdf
    • http://pazona.pcrws.com/uploads/1/3/1/4/131408100/butifebixavib_kumure_nakigobesa_kalab.pdf
    • http://files.atlantasouthcomiccons.com/uploads/1/3/2/6/132682585/bimajibemosux.pdf
    • http://files.vernonrive.com/uploads/1/3/1/8/131871479/kaxasonemetodebog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/anemia_grados_oms.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/creative_problem_solving_and_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/sasofipuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/49746066364.pdf
    • https://cdn.shopify.com/s/files/1/0430/4198/0567/files/widufekumerireg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1520/files/72381365763.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9374/files/59100031382.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/punjab_customary_law.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5149/files/unt_ba_biology_degree_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8992/files/wolabukumiwusilaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3742/5818/files/4262959817.pdf
    • https://cdn.shopify.com/s/files/1/0428/5648/0935/files/fopijelupipewamujeteg.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_off0000a8a6.bin
ab4f6fc63442fb5047c64282b333fb18207d8b55b23bcd7a7f92d54608d0d82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A6 5464 bytes
font_01_sfnt_off0000bb30.bin
51d5e3f69c0bb2005de9e779d2c0532ba82dd440b9d26ef18242f80c5b3a3684		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB30 10084 bytes

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