Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb978af4a0bd8d8…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 22:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2ba40100d62c7f151e6555da2727497 SHA-1: 2cd0ba60a15851a5a2755603d0c7a9d290c3724b SHA-256: bcb978af4a0bd8d8938d117904736de90fe070bbaa366b44e3ecfa7f1d7959f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to direct users to malicious content. The document body, though heavily obfuscated, contains this URL and a large number of other URLs pointing to Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier 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/wix?keyword=sintaxis+de+la+imagen+dondis+pdf
    • https://cdn.shopify.com/s/files/1/0466/3200/9893/files/adblock_plus_for_uc_browser_pc.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1892/files/linear_differential_operators.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/sokewejavozuwobisoru.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/genetics_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0435/5630/7107/files/97531091893.pdf
    • https://cdn.shopify.com/s/files/1/0462/2906/1783/files/windswept_house_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/batekobimidejofoze.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/marriage_biodata_maker.pdf
    • https://cdn.shopify.com/s/files/1/0447/4860/3546/files/84187437282.pdf
    • https://static.usrfiles.com/ugd/585b1d_f6e73059f7dc42e08fe2b77022fce08d.pdf
    • https://static.usrfiles.com/ugd/ab059d_13d8d4f5090c49fcb86ebc852efd24e5.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/bekazujadozuwojisesizuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/pmbok_guide_5th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/korujefupexifugi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b3.bin
064c14f4b92f12f663f33d2d82b15366ea58047fe4077d3996d0b2e292ec179e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61B3 5436 bytes
font_01_sfnt_off0000741f.bin
6d9305f6e95ba1282b96672fee6e4f7cb302e79e53faef49c7308ad0c72c0186
pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 10856 bytes