Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21796d16872e108…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 06:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f962633b3ad9411de7712d4ec5b979c SHA-1: 30053501ee0e0f1b64ccd77420d452aebc984c75 SHA-256: d21796d16872e108770239c186bfddf243803d6020f6d8754b275cf28d77df67
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body itself is largely obfuscated but contains the same URL found in the heuristic. The primary purpose appears to be SEO spam or redirecting users to malicious sites, rather than delivering a direct payload.

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=10th+bipartite+settlement+full+pdf
    • http://pudinew.hudsonhealingarts.com/uploads/1/3/0/7/130776680/2860680.pdf
    • http://files.tmsdrama.com/uploads/1/3/1/3/131384335/xatakul.pdf
    • http://files.designsbyshirley.com/uploads/1/3/1/8/131857494/861cf2.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9745/files/86321937497.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/33274544195.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/mitchell_labor_time_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/60258764606.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/vewupawizakuvogum.pdf
    • https://cdn.shopify.com/s/files/1/0435/7704/9247/files/99208732546.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5542/files/jisisomotejubabuwitinel.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/articles_of_organization_michigan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/download_asmaul_husna_arab_latin_dan_artinya.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/xarega.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/business_canvas_sample.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/mupajobupowolexube.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/20216177075.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_off0000674a.bin
ee3003b09f59c5a7e0facb062870bc06105cf8dcc60542664007f901b00ad662
pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 5520 bytes
font_01_sfnt_off000079dc.bin
56696f378338b552f83436f95559a254c0b1b1e4fc43ffce99e7cc8199945b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 10320 bytes