Malicious PDF — malware analysis report

Static analysis result for SHA-256 534ba4839d52264c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 00:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5bb47287b03d98c8387b15b91f33c39 SHA-1: dbb90906c7e53bb470a0f5f65007a5da98e059d7 SHA-256: 534ba4839d52264cea7dd6b1226df451dff2874d4839cb7b33786e6a29134d5b
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous external links. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com', suggesting a phishing or malware distribution attempt. Another heuristic noted a large number of external PDF links, many hosted on 'cdn.shopify.com', which is characteristic of SEO link farms used to manipulate search rankings or distribute malicious content. The document body contains garbled text but includes the suspicious URL.

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/wix?keyword=streets+and+trips+2015
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/fionna_and_cake_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85213016947.pdf
    • https://cdn.shopify.com/s/files/1/0433/0278/1083/files/59477800606.pdf
    • https://cdn.shopify.com/s/files/1/0435/2783/1716/files/pune_ring_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/1305/3338/files/36718077878.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/ios_10_activation_lock_bypass.pdf
    • https://static.usrfiles.com/ugd/269bb8_3c7cfe8cbce048b4af81dcfdbd74f085.pdf
    • https://static.usrfiles.com/ugd/b8c837_718bb31baaeb4d43b6c8e52a6d7fb111.pdf
    • https://static.usrfiles.com/ugd/6da380_7e87fe53cac84c24ac3d5295ad69fe62.pdf
    • https://cdn.shopify.com/s/files/1/0436/4563/2665/files/frigidaire_gallery_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/55263947228.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/tennis_elbow_physiotherapy_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/arixtra_adalah.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_off000061ca.bin
94ad4d6102176b642edeb3dc6ab728ee4d1d9588e0784b642d32dd867b60620b
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 5472 bytes
font_01_sfnt_off00007475.bin
a22e92fd23e88dac5d041d62ed06b27010a1e577dfa0bb316987437e55420520
pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 11364 bytes