Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefb283df54a7275…

MALICIOUS

PDF

41.2 KB Created: 2020-08-04 02:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e6b492a032849f9a23bb7dd36e336a2 SHA-1: 3cfbd74fc51c16197fe2b2c1fc53b6a8b5c6fcf5 SHA-256: cefb283df54a7275ec7f7ef56258cc8e26f3e37382c92621c55b7f04f942a727
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=libro+a+trav%25C3%25A9s+de+la+biblia+pdf', suggesting this PDF is part of a campaign to distribute malicious content or manipulate search results. 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.ru/pify?keyword=libro+a+trav%25C3%25A9s+de+la+biblia+pdf
    • http://putiragul.boothfolio.com/uploads/1/3/0/8/130874416/ripawenim-zedoniduput-buwawa-vujokosesagu.pdf
    • http://tusawo.selfexposed.co/uploads/1/3/1/1/131164312/mexixudadamoro.pdf
    • http://files.hawksdrama.com/uploads/1/3/1/3/131398242/c146c.pdf
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/lozofararinir.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/47790394223.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/rikosejolaretugugarilev.pdf
    • https://cdn.shopify.com/s/files/1/0438/4237/1741/files/zulomisamirema.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/writing_english_language_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/afi_23_201.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/zafawulukivekuzesidas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/24491328203.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/birch_tree_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/xitoxetafixezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2083/6254/files/jekegabakadarinebu.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_off00005d8d.bin
309b38139b183ad7645ad0fcdf8333d5cf58f6b4717dc72b4791d9b53be6c6ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8D 5320 bytes
font_01_sfnt_off00006f71.bin
64238c4a81e580b5fb415f145e8b5563856904dc5ef645bef2807dd2f895f9be
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F71 11836 bytes