Malicious PDF — malware analysis report

Static analysis result for SHA-256 472d059c7eacb2f1…

MALICIOUS

PDF

52.2 KB Created: 2020-08-13 01:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53a5c6e1c0ebe278e2faa9e5f0eec1f SHA-1: a149bd5e80307baf88f7a312af8a34749497bb6e SHA-256: 472d059c7eacb2f1bd9dbcdfdc7afacf01bf66efc5173a03013d9367f51b2c76
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector infrastructure at "https://ttraff.cc/pify?keyword=grade+10+biology+textbook+pdf". The document body also contains this URL, suggesting a lure to a malicious site disguised as educational material. The ML classifier strongly supports the malicious nature of this PDF.

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=grade+10+biology+textbook+pdf
    • http://files.villageroyaleanimalclinic.com/uploads/1/3/1/4/131438111/87b5f56.pdf
    • http://files.fun-tasticfoxes.com/uploads/1/3/2/6/132680931/zodisajutizik.pdf
    • http://welofudax.enchantinteriors.com/uploads/1/3/1/8/131857243/fff709.pdf
    • http://files.laurenbretana.com/uploads/1/3/1/1/131164079/8500390.pdf
    • http://files.eringipfordfreelance.com/uploads/1/3/1/4/131437513/vivaxofaver_tiguvixoxet_vuvaxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/luzitoxiziwigovilaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/53369188506.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/mariage_d_amour_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9989/files/enterprise_risk_management_in_finance.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/68915569838.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/wejopugaxikuburut.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7814/files/dotamixomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/10433918777.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/lugekifitoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/2031596124.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007018.bin
c24d93939facdf1075e87330b0f9e894941896aff62c20dae5048f020e122fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7018 3080 bytes
font_01_sfnt_off00007afe.bin
0301445463ac3bd71f570eb2cd53d96ed259dd4f07433d7968d00f015821b416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 5628 bytes
font_02_sfnt_off00008e51.bin
affc8f28536dd93e48b9ccd379744db8315ccbe036c69b0ee480c2d9ef33a915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E51 16824 bytes

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