Malicious PDF — malware analysis report

Static analysis result for SHA-256 7822d13dd89932fc…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 06:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd6e7532dde1567817285283d17a483f SHA-1: 193a90f06822efed460e5b1eb43d82faf93360b0 SHA-256: 7822d13dd89932fc7e7dcae7d8eaaae9b468696803f38fac226b88eacba315a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document with high confidence. The presence of numerous links suggests an attempt to manipulate search engine results or distribute further malicious content, aligning with tactics used in phishing or SEO spam campaigns.

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.me/wix?keyword=bilinguality+and+bilingualism+hamers+blanc+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/sexefomov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rijakilijupefiwopoxafeza.pdf
    • https://cdn.shopify.com/s/files/1/0462/2630/9271/files/febrile_neutropenia_with_sepsis_icd_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/wasanaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/5614/4282/files/biotechnology_in_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/fapixekajazunipekalugezos.pdf
    • https://cdn.shopify.com/s/files/1/0446/2074/2819/files/33294927863.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/fatal_attraction_assassin_s_creed_odyssey.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/aaai_2018_accepted_papers.pdf
    • https://static.usrfiles.com/ugd/b8c837_044e78700e9f47cb857e1dc0d1e58284.pdf
    • https://static.usrfiles.com/ugd/b9801a_9b3f4a838cc141e7a575b62a8ee6126f.pdf
    • https://static.usrfiles.com/ugd/5be868_e2c88c19d2ab43909d4e0641a44ba8cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/buvis.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/kidozoga.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/72253304551.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/13300588308.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_off000065fa.bin
12150ca9f88af46f0e0d6e005270f9e0bb72a9302786308964a0d6e2143b4dee
pdf-font-stream PDF embedded font (sfnt) at offset 0x65FA 5860 bytes
font_01_sfnt_off000079c1.bin
8918b5208d03a19f87c5de6fb68eda2362c918a425749c7a487c4df1de2719ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 9432 bytes