Malicious PDF — malware analysis report

Static analysis result for SHA-256 61aaccd62829b4c7…

MALICIOUS

PDF

35.5 KB Created: 2020-08-22 02:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62c2b60300b5f2ee0c1ce278775ebb60 SHA-1: eca833d227efbe72baa646bd375f5c9e5e102b9d SHA-256: 61aaccd62829b4c7f676bab8279f3fa112b9b7a885fc6fac31293cd4600b0c54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, including a primary link to a redirector disguised as a product search. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=2mm+acrylic+sheet+bunnings
    • http://files.climbingpamphlet.com/uploads/1/3/1/6/131637047/f749a.pdf
    • http://files.kristauspaliepimas.org/uploads/1/3/1/6/131606864/laluresulimik.pdf
    • http://mewivugig.danielreinhart.com/uploads/1/3/2/8/132814930/kavapuwemuzavewiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6041/8970/files/fikunakoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/makidegef.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/what_are_the_barriers_of_effective_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/48643379492.pdf
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/jimabufakadoxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9551/3505/files/carbon_based_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/57260941803.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/23272257438.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a90.bin
4f5b4d46723bf352c1e2b070345472b4cb7ec7d7f665ea421f590c744473348b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A90 5492 bytes
font_01_sfnt_off00005d14.bin
fa528f6a4dc0d20208d394d80eb95f110063d51ba8bba00e9deb190d1847d43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 10720 bytes

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