Malicious PDF — malware analysis report

Static analysis result for SHA-256 772aec14a974cd67…

MALICIOUS

PDF

58.9 KB Created: 2020-08-30 05:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e650c049151a4ea2bc928dbc051773 SHA-1: bd86588c32655f472d75c4c1f909722618bc39de SHA-256: 772aec14a974cd6752474def7277eacb0b0b2029dad062f1b83bbb5b019b8938
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are hosted on static.usrfiles.com, suggesting a link farm for SEO manipulation. One of the primary links, ttraff.com, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the target URL and appears to be generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

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/wix?keyword=barbie+cartoon+vector+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0cd3a8_bf3734d84a424e51a51a1083fda7f61d.pdf
    • https://static.usrfiles.com/ugd/9757e7_3dbe5be52206460d9e94245205ad70bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca12ee5d86bb4818a33b6b342d68e22d.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/voxuvavofizizisatewuzatip.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/amide_nomenclature.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75877947267.pdf
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/72579455534.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/12611407699.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/fopimuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9453/files/10633523620.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0464/5198/2504/files/businessman_telugu_movie_dialogue_ringtones_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/28073058757.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/67598540941.pdf
    • https://cdn.shopify.com/s/files/1/0436/0388/6238/files/wugelakawexasijevinaxekez.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/half_elf_d_d.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/barakhadi_in_english_chart_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/65096634188.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_off0000a424.bin
736be8887607a7b8998a797dcbb8c1ad4f2b0382f7ba4262f4c43d424dfa96e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA424 4916 bytes
font_01_sfnt_off0000b4f5.bin
bfa5518c3088921c81aa6936ce0cacb200437d60a6c4d15f44f49186d6095230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 12948 bytes

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