Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acf81d6bce949af…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 14:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b1c29d9aa6ce2269bf3ff2ba00b2a3 SHA-1: d0832a8be75dff3c026971ffca375810b1bc8117 SHA-256: 6acf81d6bce949afda35bad296e618f8fba2a7f2b96d17c6ba32a918a7569ecf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One URL, 'https://ttraff.com/wix?keyword=economia+de+vietnam+en+la+guerra+fria', is identified as a known malicious redirector. 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.com/wix?keyword=economia+de+vietnam+en+la+guerra+fria
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/game_sniper_strike_blood_killer_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/99418132258.pdf
    • https://cdn.shopify.com/s/files/1/0449/9639/5166/files/acuerdos_comerciales_regionales.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/50094677465.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/14777709204.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/acrobat_editor_free_for_mac.pdf
    • https://static.usrfiles.com/ugd/c83fdb_2f13d5e4955c4116b6cfde78f6aa4897.pdf
    • https://static.usrfiles.com/ugd/451461_7ab33d4a84dc445bb8f1f0c99d6a7dc5.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7577/files/html_tags_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/77212812064.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9576/files/35190053107.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/89490602920.pdf
    • https://cdn.shopify.com/s/files/1/0437/4901/5713/files/11972696448.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_off00005e12.bin
b4b73d00b6f000790ef0f21d77c549ac88f938ca0f4e1da30a4bb7e01bf3de3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E12 5180 bytes
font_01_sfnt_off00006f97.bin
4d289c8d9c7b060e4da8cffc73c7165b9e97ee8add802d1fa6d320562fd5a458
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 10412 bytes