Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ca6c0d0b516282…

MALICIOUS

PDF

42.8 KB Created: 2020-08-05 04:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a439595a831c9f4d24d4333ad270fd9 SHA-1: c7f478043e79522bc832277c3608141a2d7d7e23 SHA-256: 78ca6c0d0b5162827db6cd40651d1ba6eeb9714de38ed1960b22dec6c4d1a059
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded link structures suggest a lure to download further content, likely a payload. 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.com/pify?keyword=save+webpage+as+pdf+firefox+extension
    • http://files.yogaconnectionukiah.com/uploads/1/3/2/8/132814086/nunozalegoxoniwomo.pdf
    • http://files.pollygreathouse.com/uploads/1/3/0/8/130814065/lararovemolekewuno.pdf
    • http://files.shcsublimation.com/uploads/1/3/1/4/131437822/576f6f77377.pdf
    • http://files.margaretsheldon.com/uploads/1/3/0/7/130739731/nitomedugugujiket.pdf
    • http://files.precisionrifle.shop/uploads/1/3/1/3/131383319/996c38e08b48f.pdf
    • https://getfireshot.com/FireSh
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rofimoluxita.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/28291186761.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/zarogemopav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9616/files/dilafafuxulaxazuzu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/craftsman_riding_lawn_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/6256702495.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/dexizuxototafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/82127999548.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/82139953050.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/dodanibadaxu.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_off0000669d.bin
becf21cc663b216033db7fb631da2ee5ea2db3e09eaeb018d49450f7eb9ecaa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5640 bytes
font_01_sfnt_off000079f3.bin
67eed71582cf0dcccb3c9170bfd60d43c6b5849e0a3d84e48a6d34d8d6dd71cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F3 10604 bytes