Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fb5c8b3c19719e…

MALICIOUS

PDF

34.4 KB Created: 2020-09-01 09:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27831fbd40e874931bf1332aa1422c22 SHA-1: 3fcf94c3526962a0365eab8f17449714cd5eddaf SHA-256: f8fb5c8b3c19719e1938b8a964eb7429f9a9af4b3c6f537e4e2f6cc8be565974
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to downloading Android games and the malicious URL itself. This suggests a social engineering lure to trick users into visiting a malicious site. The PDF also contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm used for SEO poisoning or distributing malicious content.

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=baixar+jogos+android+apk+mod
    • https://static.usrfiles.com/ugd/bf0735_fab4063ba0f44b99bb408d15e5812a3e.pdf
    • https://static.usrfiles.com/ugd/136d07_2869acae690a475dacefa2793f10b0fb.pdf
    • https://static.usrfiles.com/ugd/b7ab08_1a09761b559c47d4a6e7e3b72f76f675.pdf
    • https://static.usrfiles.com/ugd/1e32c2_1725804755eb44a0a63142423a0d1498.pdf
    • https://static.usrfiles.com/ugd/b48b60_ea9da3479db84d9fb60dfabca144e10f.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9755/files/sasijaruduwuvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4805/8536/files/91193457394.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/materi_akuntansi_biaya.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/zirirosoragiganuromi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/88084410998.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/visumexopoxokudanulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6565/files/53888073909.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/5178408835.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_off00004856.bin
92ae4b0222dad811aaee2cb6e2fabb0ca203cf1712636747a8fe1633000152c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4856 5504 bytes
font_01_sfnt_off00005b0f.bin
d3736ca4175238aa959fca36905b186dc61beecb773e4ed60edbe71528c22f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0F 9864 bytes