Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfbbdaaea6ea92e…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 00:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef0906c88cae4012dcf478821b945168 SHA-1: dc21c5ebd5a1eb2cfe02696759a117bd6c9c883b SHA-256: bcfbbdaaea6ea92e603f41446bc8a1151d340dd1ff3fb4470f18067357267bcd
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector service, which is likely used to obscure the final destination of the 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.cc/pify?keyword=writing+a+bio+about+yourself+template
    • http://nebewipaw.ksupayroll.com/uploads/1/3/0/7/130739017/lajawasepipubilisem.pdf
    • https://cdn.shopify.com/s/files/1/0436/2695/4905/files/schwing_stetter_cp_30_batching_plant.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/26843091871.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/les_medicaments_anticoagulants.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/femonifodurokofixuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/clean_master_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0918/7750/files/41670967929.pdf
    • https://cdn.shopify.com/s/files/1/0434/6449/1174/files/logegamubixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6677/files/lenufuzenufijomabiwul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/nofipewovaxobojijopuvezux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/45863131653.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/sutopazogaxenab.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/
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/su

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de3.bin
20f0160ce51d9f0bb942c95d88e696b63857922d30532e27fed9933af687c630
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 5476 bytes
font_01_sfnt_off0000807d.bin
e3cdc4030056f566faf0a6e4f19de1ef040625f0ccd18b121ebada9efc1a7d44
pdf-font-stream PDF embedded font (sfnt) at offset 0x807D 10664 bytes