Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc813d5f94d91870…

MALICIOUS

PDF

37.5 KB Created: 2020-09-07 03:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c618f044d755429045b7b35cf4ad1727 SHA-1: 3e6f46a64e9e141f8c22c0254bc5bb5c6714e7d3 SHA-256: fc813d5f94d918706456063e39ecd81d01db85ae625d167b36c07efe33c82529
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a common tactic for SEO poisoning and link farming. One of these links, https://ttraff.club/wix?keyword=criminal+justice+imdb+parents+guide, is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for phishing or malware distribution.

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.club/wix?keyword=criminal+justice+imdb+parents+guide
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/63741919328.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/24386240862.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/92051008399.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/wefozibegusidagigeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/borderless_printing_mac.pdf
    • https://static.usrfiles.com/ugd/041b56_7a0d8c9cedd642fcac5954d7dae228c5.pdf
    • https://static.usrfiles.com/ugd/98857b_975f99c2ba034980bdbb78d89dea685f.pdf
    • https://static.usrfiles.com/ugd/828753_ae8f5d028cb54e3189aadc4117bf49e7.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/tejonajunuto.pdf
    • https://cdn.shopify.com/s/files/1/0430/4486/4149/files/little_house_in_the_big_woods_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/tijewugegutagusawuzew.pdf
    • https://cdn.shopify.com/s/files/1/0441/0641/6280/files/bremsweg_bei_100_km_h_faustformel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/88897533786.pdf
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/98623797829.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_off00005532.bin
03911ccd196359bd05499b99f66176d1789cb49187656eb1f2e4455dbbc8d581
pdf-font-stream PDF embedded font (sfnt) at offset 0x5532 5516 bytes
font_01_sfnt_off000067cd.bin
c22bd5e7413a9edd4d8d877f0a116578e68f0745d93d8f6bbdb97ca778b75cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x67CD 9796 bytes