Malicious PDF — malware analysis report

Static analysis result for SHA-256 55531617bd350402…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 09:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc5dc7f7f3a7442d43b70ce3b81578f1 SHA-1: 082f40aa50d270f349bc56d09720f2f36370f7bf SHA-256: 55531617bd35040232bc8cdb88994423d4ece4e776b1e76889595a823af8ba95
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector to `ttraff.com`, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains the string "Ms sql server developer" and the URL `https://ttraff.com/pify?keyword=ms+sql+server++developer`, indicating a social engineering pretext to drive traffic to malicious infrastructure. 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.com/pify?keyword=ms+sql+server++developer
    • http://files.aradhanaschoolofdancing.com/uploads/1/3/0/9/130969982/sinezifeluba_tapuni.pdf
    • http://vimade.arielpani.org/uploads/1/3/1/0/131070420/xerobotonasudizitag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/ponaderexujusozexuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/97240484903.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3829/files/49448503160.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/mupijamidalikufitaxef.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/affidavit_of_birth.pdf
    • https://cdn.shopify.com/s/files/1/0435/6361/4369/files/hacker_and_moore.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/preeti_unicode_nepali_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/76977852575.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/ap_eenadu_epaper_today_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/2393951344.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1583/files/43064090882.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/1246792931.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/71616410344.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_off00005ce9.bin
ef6105a20f39055f25ad1a564400589df8f66a834d96658a2828c12f866853fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE9 4488 bytes
font_01_sfnt_off00006c37.bin
90dfe6a9871c102c4ffb77cbd2a34a6d0e2a29e0db90a8788efb20037e5bf856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 10256 bytes
font_02_sfnt_off00008f58.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F58 4324 bytes

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