Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31a560528bd0b7c…

MALICIOUS

PDF

44.8 KB Created: 2020-09-02 10:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c251234ae5c1aa88d8ed3d6568813d SHA-1: a208ad0bc048fd2c009521015ec4ea87bd52aac2 SHA-256: c31a560528bd0b7ccb1e3764a17446973ba45b5c6066765f5bc83c0203ab1945
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, disguised as a template for crepe paper flowers. The ML classifier strongly indicates maliciousness. The PDF also hosts a link farm of other PDFs, likely for SEO poisoning or to distribute further malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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.me/wix?keyword=giant+crepe+paper+flowers+template
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/giwefigivituvosamipexav.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/darkness_rises_witch_skill_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/bonded_space_maintainer.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/96110761068.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/mokomofufidotoxozolur.pdf
    • https://static.usrfiles.com/ugd/d43733_2790ee68f7684210b33a6f6f56427bf8.pdf
    • https://static.usrfiles.com/ugd/d94ae5_444cced8d538474d9b4e17d23c1ad97c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d090bb308f51431c84846676e81c1668.pdf
    • https://static.usrfiles.com/ugd/93971e_234dbb7300464fbb9ca3efeb27c6ecdc.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/jodafosewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/fifototirivatu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/47694194173.pdf
    • https://static.usrfiles.com/ugd/f0e51d_e3fa57f199ff4e7f8fba05e84274fff1.pdf
    • https://static.usrfiles.com/ugd/6cfc61_5b3f2a1c898b4b7583dac35362746e99.pdf
    • https://static.usrfiles.com/ugd/9c0842_a2ae0975eddc4ca9b47bafc30323837e.pdf
    • https://static.usrfiles.com/ugd/b8c837_350ed67898fa49bc8ca490459bc7a8c9.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_off000070ba.bin
942c26a5faf4a2644fc23ec9965913dfde8716ae4d462f86fbbe22e33e2fd9af
pdf-font-stream PDF embedded font (sfnt) at offset 0x70BA 5284 bytes
font_01_sfnt_off000082b7.bin
d3925dafebf9bdc4931c29ba8011451ef511b8a47c9f41358414f656fdd94308
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B7 10352 bytes