Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4b47e19dbf92ef…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 08:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08439ca75da1ccb1f5912bc40e7da900 SHA-1: 096c953bc3798697707b750b9f9509b34accc9d7 SHA-256: 6b4b47e19dbf92efb60155180599419f5ada5016b24f03b41827c08c77825858
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a lure for a free anti-malware license key. The ML classifier strongly indicates maliciousness. The presence of numerous embedded links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=bytefence+anti-+malware+pro+license+key+free
    • http://files.reach4thestarsstore.com/uploads/1/3/1/4/131406182/tepuzikofep-jinajofabujis-vumeluzokalimut.pdf
    • http://files.villaparguerahotel.com/uploads/1/3/1/4/131409761/2980563.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/3/131398350/5cf00da3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/55374185563.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/shadow_priest_best_in_slot.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/ansys_workbench_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/nokisopojikopadazajifutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/bootstrap_3_datepicker.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/aprendizaje_vicario_psicologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/39760671063.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/57107525716.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/tobulexix.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/kalnirnay_calendar_july_2020_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/free_printable_may_2020_calendar.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_off000061b9.bin
4ab72b9f5d6aa8830b420b8b4a7cc6b7a347863c0962fb9dfe2fc7f6875177c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B9 5500 bytes
font_01_sfnt_off00007475.bin
b0eea8a6a7b63dc282abb214c41f2e613cd42c5286b0013b34935f0fd02de97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 10340 bytes

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