Malicious PDF — malware analysis report

Static analysis result for SHA-256 483a3dd1a497ea3c…

MALICIOUS

PDF

42.0 KB Created: 2020-09-02 02:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccff5b3da6cb2c4a137bc47f7f3fe8f5 SHA-1: 2861fc8dc38b89c26b0a518bb5dea957e6a34f95 SHA-256: 483a3dd1a497ea3c19fbe1091b2dbbadae95b260ff7bc039c2dc516998110461
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/wix?keyword=coyuchi+220+percale+sheets, which is likely used to lure victims into a phishing or malware distribution scheme.

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=coyuchi+220+percale+sheets
    • https://static.usrfiles.com/ugd/0baf77_64c1641d24ce491eb8d1a6ab622259bf.pdf
    • https://static.usrfiles.com/ugd/a467d2_b4786abfb5634a26a2aa282980c5d85e.pdf
    • https://static.usrfiles.com/ugd/4c7633_0ec5b885a6cb430b8f3ac20a7063a20f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3de774401a19459cab34877a8135017a.pdf
    • https://static.usrfiles.com/ugd/7f46b5_ef0b1a6c0d2846ab952d1899f930fb54.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/2008_ski_doo_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/35636555653.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gipal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/75878043902.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68906731860.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/bed_bug_blood_on_sheets_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/vuvagaxavesesufo.pdf
    • https://cdn.shopify.com/s/files/1/0449/0015/5559/files/15721614082.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/43890682180.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/movem.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/mezosotolufabototuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/xidedow.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8770/files/pexozojagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/3934628844.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055f8.bin
0a45f72ffb5743a25647abe3bddc0314c9d3a14910d4f9d78a860d0f42a85e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F8 5196 bytes
font_01_sfnt_off000067c1.bin
ca83f59f76106f37f905a16674cd15511197fab2eb85773e2d8edd0770fe2ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C1 10936 bytes
font_02_sfnt_off00008cd8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD8 4324 bytes

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