Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d667a2936d8ba84…

MALICIOUS

PDF

61.9 KB Created: 2020-08-21 07:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec2bde0a88cd896735b8569abb0c84a SHA-1: d3373dd7cc9c15f90a513e0a12eac3b94ae6df24 SHA-256: 4d667a2936d8ba84e605798f61c9cbc82540d16558c291604f1ab5742394ab8a
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=kelkar+committee+report+on+gst'. This URL is presented within the document body, disguised as a report on GST. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive document title and a malicious redirector.

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=kelkar+committee+report+on+gst
    • http://files.rpmhst.com/uploads/1/3/1/0/131070212/64f789.pdf
    • http://gorevu.leahradetsky.com/uploads/1/3/0/7/130739267/xemevofeja_risad_favituto_zamawu.pdf
    • http://tumavagul.brevardsurf.com/uploads/1/3/1/3/131382595/sodisofufonuw-dujigeduz-zojesifomajav-lotodegedilaben.pdf
    • http://files.concretebendoregon.net/uploads/1/3/1/3/131384573/e9c002504.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/21065817993.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/2631941725.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/2335862204.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1314/files/pisetemitewevufazekefageg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/49829444525.pdf
    • https://cdn.shopify.com/s/files/1/0452/6794/3586/files/cissp_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/tarutekugego.pdf
    • https://cdn.shopify.com/s/files/1/0429/0769/7305/files/43986780087.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/99640010364.pdf
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/21072871687.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/2967391505.pdf
    • https://cdn.shopify.com/s/files/1/0447/7688/2342/files/biocentrism_robert_lanza_free_download.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_off00009daf.bin
9a0e9f03c333a34b8f1fffd88a5e965c8cb6021dffda0bc112c74df6f6566d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAF 5284 bytes
font_01_sfnt_off0000af92.bin
0618535235aa0b23d29e49e8eaf3557702e3aa002e0cfe1e522ec1ea11de5e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 10944 bytes
font_02_sfnt_off0000d52f.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 16164 bytes

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