Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f6a62178ca165b…

MALICIOUS

PDF

36.8 KB Created: 2020-08-31 07:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0859bd2d0f8673f0f7da36b531fe803 SHA-1: cf2c5a75e935f21a27abfb9ca51565eedc918ae8 SHA-256: 88f6a62178ca165b5d9751bedd8d26dd5872c1d81a8056fe8415db41800ab95b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.com/wix?keyword=aashto+lrfd+bridge+design+specifications+8th+edition', is flagged as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but contains the same URL and references to PDF specifications.

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=aashto+lrfd+bridge+design+specifications+8th+edition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6575/1192/files/70067390993.pdf
    • https://cdn.shopify.com/s/files/1/0433/6261/5446/files/phineas_and_ferb_act_your_age_galler.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/digekesavirawufuvoporud.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/16503343233.pdf
    • https://static.usrfiles.com/ugd/63d3ad_819083b1403845619e9dc52ac93ed7d4.pdf
    • https://static.usrfiles.com/ugd/57c819_5933356b57084720a75b29d8b39d5005.pdf
    • https://static.usrfiles.com/ugd/b8c837_66a6cfa2ee224b98bf7f8cd17310c0b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c9be9758ab04a049720070d91bc0fea.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/28951134514.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/16154058196.pdf
    • https://cdn.shopify.com/s/files/1/0465/8443/0759/files/jadad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6895/files/lunarenimezelatanejuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3986/7559/files/palejarovebaxosenurugoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/xasujatidudaxorum.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/totetawotifuzipopev.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/41689903482.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6389/files/24008320457.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005110.bin
05027cd9f8c3f4b4003cc91f39516c1346ef650a37f16f8bef6bf5c7315c74e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5110 5740 bytes
font_01_sfnt_off0000648b.bin
1462b5de897b393273169e8d28929a66ecbb8d1d8f7c4ae70db34481c797af6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648B 9816 bytes

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