Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2135282e575255…

MALICIOUS

PDF

51.7 KB Created: 2020-08-20 19:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c20f762625657dc1addce320f8d0b1ab SHA-1: 848d1c62903617c8e6cf87f0ba7339b3bb22daf7 SHA-256: 5c2135282e5752550b7fd66f6fdfa2abe99fb149e2ab905605e8c2cd270d5665
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Android device manager apk old version' and a URL that appears to be a lure. The presence of a link farm and a malicious redirector strongly suggests an attempt to lead users to malicious content, likely a phishing page or malware download.

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=android+device+manager+apk+old+version
    • http://wawukegi.thesociologicalcinema.com/uploads/1/3/1/4/131453329/bizop.pdf
    • http://files.tinezrootsclub.com/uploads/1/3/0/8/130813888/5449289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/final_fantasy_xv_comrades_weapons_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/nenusugibul.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/pugovibemivabuwelemutaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/82977011085.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/33062869826.pdf
    • https://cdn.shopify.com/s/files/1/0435/8442/2051/files/partnership_agreement_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/sorekativuzujajeguji.pdf
    • https://cdn.shopify.com/s/files/1/0438/6573/5328/files/rekefozedamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/application_form_for_ukrainian_passport.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/sanogimilapibuzewawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/denot.pdf
    • https://cdn.shopify.com/s/files/1/0463/3863/7981/files/senepagulutesipesidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/apprendre_a_lire_et_ecrire_l_arabe.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_off00007ff8.bin
db04750853b453f223b24d38b13030252259398c25a848d85a931c82e9a1b547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF8 5504 bytes
font_01_sfnt_off0000929d.bin
bbc5e2f9e7b899210cc81752ed7203f12e504e25785e5d4fa88cd154a4b0b282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x929D 14920 bytes

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