Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe72d875af3f020c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-11 16:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d79411e38b2d38c160ad3972387bac1d SHA-1: 3f17177315f795ab28f6d52df9affdf6aa8daf22 SHA-256: fe72d875af3f020c10719ae566e1dc28bc37ab4c2bb1a6e87374c9d814176aa6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on 'cdn.shopify.com' and other domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to a malicious site via the embedded link.

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=advanced+javascript+pdf+download
    • http://vuxeb.bikewalkroseburg.org/uploads/1/3/2/8/132814930/1358211.pdf
    • http://files.fromthetopadventures.com/uploads/1/3/2/6/132681456/joguta.pdf
    • http://files.beesbeautybar.org/uploads/1/3/0/7/130775776/51edc8.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/81408743362.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/75455177060.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/kokikowubasajanigozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/wilanivumalekakoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/tcfbank_routing_number.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/2809139783.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1810/files/97363021484.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/circular_motion_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/bihar_si_previous_year_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/tukaguvanedisemakagoginij.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2359/files/18713145175.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/zadebururewuzixexupoxig.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/
    • https://cdn.shopify.com/s/files/1/0434/9889/7

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c66.bin
e2ae30edf8a86645c3a0b70321910f9540bed440be8b9263b895e82762794d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 5364 bytes
font_01_sfnt_off00007ecc.bin
ca6bd065bcbe755697d25a77822f538d6df63a715413e34fd1790a533cb4ceb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECC 10128 bytes