Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacf99d67eded721…

MALICIOUS

PDF

49.0 KB Created: 2020-08-02 02:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d5784bd13336dcd3f11961dce8b5da SHA-1: d70192cea047af7e541943472c8973e311363300 SHA-256: dacf99d67eded721240cf1c69523dde50a17be72f19c008b5104faffde42601a
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector (ttraff.com). The document body, though heavily obfuscated, also contains this URL, suggesting it's a primary lure. The presence of numerous external PDF links, many hosted on shopify.com, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector as the primary attack vector.

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.com/pify?keyword=big+balls+song
    • http://files.budderpros.net/uploads/1/3/1/4/131438840/bugufodatezik.pdf
    • http://files.durhamshowcasefestival.com/uploads/1/3/0/7/130775180/6742707.pdf
    • http://files.sharmalabuw.org/uploads/1/3/1/3/131382721/lowikeju_wikurusomuded_bosotebuga.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/92089677380.pdf
    • https://cdn.shopify.com/s/files/1/0428/1827/3446/files/42672823707.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/87957507985.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/8085964340.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/3852223439.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/94134859689.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/robidavetarufugitotezaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/tecumseh_carburetor_adjustment_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/46311533500.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/23128342087.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_off00008295.bin
13ce23fe633328d3be6d4f2f5a207070e6bffc95545848a3d0f17c3430824848
pdf-font-stream PDF embedded font (sfnt) at offset 0x8295 4944 bytes
font_01_sfnt_off00009381.bin
8662d3621001ad2da827460897be0d47549ba0cf14fa699d43515ca7706e3037
pdf-font-stream PDF embedded font (sfnt) at offset 0x9381 10592 bytes