Malicious PDF — malware analysis report

Static analysis result for SHA-256 756d73be607f4dee…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 21:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33a2aa24a7a6ffd3bbbe3692ce10bf07 SHA-1: 5902c341b5d2f804600b5a23e5e2b2f5747c4d6e SHA-256: 756d73be607f4dee4ae0a27ddc9c5bbcc2be7eb0dce20b32b70245a2dc4878c2
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links pointing to external PDF files, many of which are hosted on Shopify. One of the primary links directs to a known malicious redirector. This suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=sap+pp+capacity+planning+pdf
    • http://files.archetypeweapons.com/uploads/1/3/0/7/130740442/bokop.pdf
    • http://files.cborbaphoto.com/uploads/1/3/0/7/130739962/juxajukek.pdf
    • http://files.oasischurchaiken.com/uploads/1/3/1/3/131398374/napojabibo_pepig_vuleno_bozagu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/65531099984.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/mifuvuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6904/files/694939113.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/mofegagaronokiwiwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5070/files/gazepuxerafasoripibusojur.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/4597661174.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/21083231748.pdf
    • https://cdn.shopify.com/s/files/1/0429/4171/0499/files/92823786437.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/borutukurezovafadubuma.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7445/files/18284139715.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/cosco_car_seat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/gopuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/pokomoves.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/99356151314.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_off00006870.bin
98ffd20f903a875bd78881c84e70c34320876d51d4c687f1ca9c92ba4a725e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 5256 bytes
font_01_sfnt_off00007a73.bin
794c214d8f018a59c29752e1ad5928a54132e3b0659e516eeb584b792011cffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A73 9964 bytes