Malicious PDF — malware analysis report

Static analysis result for SHA-256 188aa83cfc28156d…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 00:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1007789b651c9e34f685bdc9bb4e5ad2 SHA-1: a054ea2be030b451d79788b70738ae9815e56698 SHA-256: 188aa83cfc28156d796af3ecbf814e2011eb4605bab549965beaf167ffa0f108
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the link `https://ttraff.cc/wix?keyword=bench+dips+form` is used to redirect to malicious infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links points to a link farm strategy, likely for SEO poisoning or distributing further malicious content.

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.cc/wix?keyword=bench+dips+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/sovukun.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/kokalifokopowuxijofoxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/vixokuxolivimona.pdf
    • https://cdn.shopify.com/s/files/1/0438/3014/9270/files/spider_man_homecoming_coloring_sheet.pdf
    • https://static.usrfiles.com/ugd/9d66c7_f8ddcfb600ce41408b746b7205a649d3.pdf
    • https://static.usrfiles.com/ugd/e2c250_63bae1c5e726457e82af166c80fa2e9c.pdf
    • https://static.usrfiles.com/ugd/79e0dc_261f78f06dc34eaf8d8916d5b2689d0f.pdf
    • https://static.usrfiles.com/ugd/12745a_66046fd56e674c5c9d5d416251399f88.pdf
    • https://static.usrfiles.com/ugd/73f3b0_0f43a06321d747398b62bff07227cad5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd761afde9dc46d5aa79391bae547ccc.pdf
    • https://static.usrfiles.com/ugd/83e24f_b862ce33af5a481ca8e432bd9649205a.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/ejercicios_de_alcanos_alquenos_y_alquinos_para_resolver.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/38267725036.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_off00006231.bin
1c58fc2780c660a2f26d6cad2b16f9bfe9421f5e56a82e1dd0a79c068e16e183
pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5204 bytes
font_01_sfnt_off000073c0.bin
cf33463888cc8f102d38736955f7e725f885df0dc0087190d807b03ea8edc165
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C0 10028 bytes