Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ca885a4dd7bdc2…

MALICIOUS

PDF

45.4 KB Created: 2020-09-01 08:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f297637a44238d86b43c8c2b3051010a SHA-1: cfa5f16809bc84536fab66a0452be38867a88231 SHA-256: 22ca885a4dd7bdc20e308af4d10d568c10194361b09651fe34dc8e5605f814e8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One of the primary links, however, redirects to a known malicious domain (ttraff.cc). This suggests a social engineering tactic to drive traffic to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=twin+bed+sheets+walmart
    • https://cdn.shopify.com/s/files/1/0430/0269/1743/files/debivuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/88836767794.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/wadix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/wuresidagivofixuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0894/8386/files/basketball_game_information.pdf
    • https://cdn.shopify.com/s/files/1/0429/2509/7126/files/53414719764.pdf
    • https://static.usrfiles.com/ugd/f96b02_74aeddf0a8274ed69ded21a1ecd14e07.pdf
    • https://static.usrfiles.com/ugd/7f16bd_312995b921c2420db6cf424053881271.pdf
    • https://static.usrfiles.com/ugd/b80405_0bfad544adbb41e285435fc96f7eaac6.pdf
    • https://static.usrfiles.com/ugd/f80014_953075be13da4cc69bb4d3cf0d87e19a.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/89600701682.pdf
    • https://cdn.shopify.com/s/files/1/0439/2560/2472/files/roxelupulebiwupetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/dufofesaxakozavunej.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/algebra_1_prentice_hall_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/fakeguluxosolososa.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_off00007366.bin
b397ddabcf88691dc42325108c043db32b75cbfab9ac351379b8d6fb32d13be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7366 5244 bytes
font_01_sfnt_off0000851a.bin
19183e2175a01131c71075915ded2326afbf05eb10b7cce0bab066c29e932f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x851A 10512 bytes