Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d6c3e886b89a52…

MALICIOUS

PDF

111.5 KB Created: 2020-08-31 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9201613a8f00fee4a466c3030afc10a SHA-1: 623e8df3b7df5ac3af213a91d78a35826a88a0fa SHA-256: e9d6c3e886b89a52e9f834c8eafb15b63a05d9b629fa36b4182c0b015c9dc2ed
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=junit+mockito+docs'. This URL is presented within the document body, disguised as relevant documentation to entice clicks. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector link is sufficient to indicate 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/wix?keyword=junit+mockito+docs
    • https://static.usrfiles.com/ugd/b8c837_6366e65a4a3b459eb9fa0198f48752ea.pdf
    • https://static.usrfiles.com/ugd/3bca44_e1241b6f51f3440c9dee4458f0ba0171.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fd8ef06d5e1496ba36508712f43b540.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6c34eea607d423bbeb400693806f6c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b6e3b6021034155861f02ebd27a7b7e.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/ati_nclex_rn_review.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/fevefetipivikoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3422/1466/files/melevuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/lineage_2_revolution_elven_elder_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/10176276718.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/49350757561.pdf
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/woporavanasasoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/zujujivunazoto.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/7149406898.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_off000174b5.bin
e1f289c809168b82092599205af1ff5bd0ff0dc6e5ed8fbd381e7e814dca6b1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x174B5 4800 bytes
font_01_sfnt_off000184f8.bin
a1afe03185b6005f4545ba00d84cfa1d1ee5b6f7135f7c4a60b893752ae3bef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x184F8 13672 bytes