Malicious PDF — malware analysis report

Static analysis result for SHA-256 493441193ac32024…

MALICIOUS

PDF

35.6 KB Created: 2020-08-25 08:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39e76779bda5e8d8f087f0bc52c36cb5 SHA-1: 4d925771be9055c3a18ed273799cdc06049fa5a3 SHA-256: 493441193ac320241a2a269be1311f79512f948df02c959e9afad157be0aefc2
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=allahabad+high+court+ro+aro+paper+pdf'. Another heuristic identified a large number of external PDF links, suggesting a link farm for SEO poisoning or traffic redirection. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector appears to be social engineering via deceptive links within the document.

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=allahabad+high+court+ro+aro+paper+pdf
    • http://begupu.newwoodturners.org/uploads/1/3/2/7/132740267/zoboregekalamojaba.pdf
    • http://files.donmalcolm.net/uploads/1/3/1/3/131379496/bolifolurari_kigul_ninusuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/vuvudiwuxagejesav.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/xigufefepobakusorijusemek.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/deginemodotanevisoju.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/wuvigikanoredibeput.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/72671108649.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/windows_7_enterprise_activation_key_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4847/files/cancer_de_mama_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/kepemiposijixosexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/tovizej.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/58694892105.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/29972353850.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/talina_ann_zsido.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_off00004c87.bin
611c79142333b141a887487c435793bbaef9f3d72002754149312babc169cd48
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C87 5368 bytes
font_01_sfnt_off00005ebe.bin
6ebb373e9fb90a946ea385229ab1db1d0493118c469457c66e6b9dcc54c0a3f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBE 10144 bytes