Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c64462877d0d8e1…

MALICIOUS

PDF

54.2 KB Created: 2020-08-17 18:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 747c7eddb1b5b118b43a450dc986a127 SHA-1: cc3336cc02a4c0e0288823b5175bbc234245f3b2 SHA-256: 0c64462877d0d8e1653f0c39a447d6b6ad0343ac4511ae564ecfa829fe07a1e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, further supporting a malicious intent.

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=achena+atithi+movie+song
    • http://rulutuk.xbosak-art.com/uploads/1/3/1/8/131857631/5991478.pdf
    • http://bulitefo.beauty-by-bree.net/uploads/1/3/1/4/131407181/a883e85ed8.pdf
    • http://liwubar.elainedodgecopy.com/uploads/1/3/1/4/131452883/b3cb38bcc25694b.pdf
    • http://vazeko.chinoyouthmuseum.com/uploads/1/3/0/7/130775386/1e9523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/relationship_between_archaeology_and_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0434/5430/0327/files/84722141921.pdf
    • https://cdn.shopify.com/s/files/1/0432/4537/1549/files/zamuwoturafojano.pdf
    • https://cdn.shopify.com/s/files/1/0435/8121/0787/files/91174019037.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7358/files/velarurike.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/vojukolado.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/66470028969.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/sasufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8450/files/girojilovuwore.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/34764649080.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fawalonilon.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_off00008ab5.bin
9ef24e4feb96b3dc5416de45f28752bcfcf0983c6a69d8adb3eb6b7bb300af83
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB5 5132 bytes
font_01_sfnt_off00009c07.bin
3048c7cae790bf3f11219aa03ed6b4704df5442d2b1ced4450289eb457a95211
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C07 14676 bytes