Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb3161513e9bc41…

MALICIOUS

PDF

38.3 KB Created: 2020-08-19 08:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d87ee61a733d64bff1fa3bafb56138 SHA-1: 915ab3fac6891ed84b0e4c5f3c28c3ee8b9c855f SHA-256: fcb3161513e9bc41146b92c01d89670201ea6989917d5e4cf0b1de6b09d96d06
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=boi+star+rewardz+app'. Additionally, it exhibits characteristics of a PDF SEO link farm, hosting numerous links to other PDFs on Shopify. The document body, though heavily obfuscated, contains the same reward app lure and the malicious redirector URL. The combination of these factors strongly suggests a phishing or redirection attempt.

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/pify?keyword=boi+star+rewardz+app
    • http://files.arabwatersource.com/uploads/1/3/0/8/130814907/tolozavevorupir.pdf
    • http://woxubo.boiserealestatejournal.com/uploads/1/3/1/4/131406082/najavijutabafik.pdf
    • http://files.rippleswithtime.com/uploads/1/3/2/6/132683001/8515713.pdf
    • http://files.austinahh.org/uploads/1/3/0/8/130813778/mezevinudavo.pdf
    • https://cdn.shopify.com/s/files/1/0463/1330/8325/files/sijus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/leveling_uniques_poe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/adding_fractions_like_denominators_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/3457104402.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/37990053044.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/23515363342.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/journey_only_the_young_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/22200538670.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/download_tutorial_photoshop_cs3.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/union_budget_2020_20_download.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_off00005b17.bin
ec5a6c99071d85cbcd4ba4fda2eb58dcc12a55e6125b83d9c7ba8f0cc464ea2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B17 5112 bytes
font_01_sfnt_off00006ca2.bin
45b85be2c421f7809daedc4aeb9a3e9c8ee940ca46bc6f69d2c0ca98d37ee2d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA2 9412 bytes