Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da81afae634e1c1…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 09:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1df2a3478a6a8e8d7d3a06c7466b22d SHA-1: 8ab72279f2575c24c2ea4a988529a88a0a055ce0 SHA-256: 6da81afae634e1c133cb117006a990ad48c315b5615f8a953bd86ee2909e90fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a 'flood risk assessment template' which redirects to a known malicious infrastructure URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the 'PDF_SEO_LINK_FARM' indicates a large number of similar links were present. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=environment+agency+flood+risk+assessment+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/73065183214.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1879/files/lofewakulamazumik.pdf
    • https://cdn.shopify.com/s/files/1/0464/7210/2040/files/android_pokemon_randomizer.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/74717536334.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/sexonufuwobagawu.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6a1dd58cfee42ee9a569df62f8afcd9.pdf
    • https://static.usrfiles.com/ugd/fbccce_8ad69e76dfeb41d89ccae04d4c888871.pdf
    • https://static.usrfiles.com/ugd/de02f3_26c581cc2ab745fb9476d7c8b056947c.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/gobimulutojen.pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/jofofiwujimimavaxobowimad.pdf
    • https://cdn.shopify.com/s/files/1/0435/3527/0039/files/45847974485.pdf
    • https://cdn.shopify.com/s/files/1/0461/9173/9043/files/35448071557.pdf
    • https://cdn.shopify.com/s/files/1/0463/2710/3643/files/60739024237.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3189/files/brainwave_entrainment_app_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb4.bin
5ae5b5415a87ec5a75aea76531938262d9928eba8ff03d8829511325cdb5b886
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB4 5444 bytes
font_01_sfnt_off00007229.bin
8148da1eabf96f136fef35ad79748b670efe0f1f33a06fb2b7fb4e417e43dc6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7229 9952 bytes
font_02_sfnt_off0000942e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x942E 4324 bytes