Malicious PDF — malware analysis report

Static analysis result for SHA-256 99933f9352c7e1db…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 15:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f048a4efaed70340fbf48b0e8ce7db9b SHA-1: a3ef2fac1d8556df0a19882254636613ea7f812a SHA-256: 99933f9352c7e1db8943dbaa5513804fb57d52bdbaee68c72a1a5e6b26654623
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector infrastructure. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=autocad+pdf+import+missing+lines', is the primary indicator of malicious intent, designed to lure users to a harmful site. 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.cc/pify?keyword=autocad+pdf+import+missing+lines
    • http://files.lizacostello.com/uploads/1/3/0/8/130874510/powunamuk.pdf
    • http://files.andrewrstjames.com/uploads/1/3/1/3/131379680/xenalizitanifek.pdf
    • http://jusop.paternosterproductions.org/uploads/1/3/1/4/131437792/fopemamezofibok-kurog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/rakiwel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/gesobudatusoziruw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/vewazevesunixarob.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/33297770123.pdf
    • https://cdn.shopify.com/s/files/1/0435/6292/6229/files/mokexoribekuzisapebavas.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/dulova.pdf
    • https://cdn.shopify.com/s/files/1/0440/2679/0053/files/accounting_principles_and_procedures_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/43301306063.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/69359902022.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/vesereboposedugi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/asus_realtek_audio_driver.pdf
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/lirarewep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/39881787649.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_off00007320.bin
5b08a0d1d3e37b6026a21444c24c00d8fe1e75cb1d23d4edf9cbc3dce053ef18
pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 5464 bytes
font_01_sfnt_off00008598.bin
dcd63bccfe192ca43174fffb67a494a3c5aa30b0af8904f1ace6296b661a94ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8598 10528 bytes