Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84974f3009bfb7e…

MALICIOUS

PDF

43.5 KB Created: 2020-09-07 12:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30dbf8f1c0f10c380c5d43d50e357322 SHA-1: 1d1478a6ddc08c4f96e540f3551a3a26dd1a43b6 SHA-256: f84974f3009bfb7ef4b926f99b0d45007fcae492f350189714d59bde603220ec
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector and others to a large collection of PDFs hosted on Shopify. This suggests a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery.

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.me/wix?keyword=eye+of+beholder+2
    • https://cdn.shopify.com/s/files/1/0429/8555/4073/files/aiims_delhi_answer_key_2019_nursing_officer.pdf
    • https://cdn.shopify.com/s/files/1/0434/1327/4780/files/78304072416.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/10793022562.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/43167395725.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/manga_in_theory_and_practice_the_cra.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/44637636307.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/817823807.pdf
    • https://static.usrfiles.com/ugd/50c35f_e4ac8b5116ae45a7ab42cd4532c6e1f6.pdf
    • https://static.usrfiles.com/ugd/38eac1_c33d1497ee2f4cbfac7e4274b4cf63ef.pdf
    • https://static.usrfiles.com/ugd/c7a620_cd86e734586e4f889b6ce78af1771c4c.pdf
    • https://static.usrfiles.com/ugd/abd6ea_22f12774696941fe8ac912ffca9ce8f7.pdf
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/edit_free_online_without_watermark.pdf
    • https://cdn.shopify.com/s/files/1/0440/6027/8949/files/feeding_guide_for_babies_nz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1059/files/chambers_of_xeric_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/6048103189.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_off00006d84.bin
241253b3ccddefa24b2417365a521b4fab5cfb696ca348c5e689d7886f5f2520
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D84 4940 bytes
font_01_sfnt_off00007e51.bin
bfb9d62e116950002205aaed2aa9bebecb1f03769eb514b5b1eeb700c0cd4f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 10300 bytes