Malicious PDF — malware analysis report

Static analysis result for SHA-256 1091b8db2caca028…

MALICIOUS

PDF

44.9 KB Created: 2020-07-19 22:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f8434ce0743afb461e6d22866faa7b9 SHA-1: b708eef5f296d29f214edd8c6d8235c677f678ca SHA-256: 1091b8db2caca0286d2826b9842647271c0870ed48676f80c4f331023cbcb720
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on WordPress and other sites, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=love%20in%20vain%20guitar%20tab%20pdf', indicating a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=love%20in%20vain%20guitar%20tab%20pdf
    • http://files.losacres.com/uploads/1/3/1/3/131380651/jigumig_rofovurubo_buferan_jajife.pdf
    • http://files.skye-salon.com/uploads/1/3/0/7/130739076/lodibeg_konapep.pdf
    • http://files.perceptualteaching.org/uploads/1/3/2/6/132695554/gidevapoxiselid.pdf
    • http://files.kivistocarwash.com/uploads/1/3/0/8/130874575/48f176.pdf
    • http://files.misfitpictureshows.com/uploads/1/3/2/3/132302732/bepofekitenuteruvagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nibogosajor.files.wordpress.com/2020/07/4422831577.pdf
    • https://bubusajofugi.files.wordpress.com/2020/07/viwozo.pdf
    • https://zizetiso.files.wordpress.com/2020/06/jobegatavebasodivopo.pdf
    • https://kijomevoduno.files.wordpress.com/2020/06/muwefoxiximulokarip.pdf
    • https://safowus.files.wordpress.com/2020/06/4756771517.pdf
    • https://wazogakulumu.files.wordpress.com/2020/07/fatavavotilakavakaragoka.pdf
    • https://rebaxoduzun.files.wordpress.com/2020/07/nolofosusiresigolufuri.pdf
    • https://suwedogop.files.wordpress.com/2020/06/kavipinitivibitofib.pdf
    • https://kevomusanen.files.wordpress.com/2020/06/95433479840.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/445461162.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/54576035872.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/rejosegivagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/wamoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/tafoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/jojivisatomusaref.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_off000064ed.bin
13e684c64113440113cd30fe1f9377eb9a06e798c345c76d0461304408f02cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64ED 5020 bytes
font_01_sfnt_off00007618.bin
4bb5aeb96690ecce5c127844b4cce682b403f00d5a67774052f1bf7697cc59fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7618 14896 bytes

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