Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb15d13f20cabb9…

MALICIOUS

PDF

41.1 KB Created: 2020-07-25 05:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6d7b249b85906c6ad3e14899b3c42c SHA-1: 448034d77f286ae2c6c25e8956aad5f8714ec820 SHA-256: fdb15d13f20cabb91cb0712a62710799897fda8b8df5b59aba3e4d036dc5d94d
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a "Bg phonetic keyboard". The presence of a large number of external PDF links, many hosted on cdn.shopify.com, further supports the attack pattern of link farming for malicious redirection.

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=bg+phonetic+keyboard
    • http://files.lclutheran.org/uploads/1/3/2/8/132814791/jopevotozefil-fawozowujevo-turireg-dilap.pdf
    • http://files.lionsmarkcontracting.com/uploads/1/3/2/6/132681728/lazotomo_sijosi_fatupa.pdf
    • http://files.viewfromtheoutfield.com/uploads/1/3/1/8/131871462/dosojunajux.pdf
    • http://files.bccnest.com/uploads/1/3/0/7/130739340/4486063.pdf
    • http://files.lclutheran.org/uploads/1/3/2/8/132814791/jopevotoz
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8893/5067/files/fikosudaxitopurivozevan.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/beguwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/kitevadigiju.pdf
    • https://cdn.shopify.com/s/files/1/0435/6902/1089/files/janusedawidolifokawiseri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/24419753132.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/pesoxaduse.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/82497658435.pdf
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/vizepujidarawotutedagatib.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/49309755813.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/govuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/5648/0935/files/rezavazoxubidojimos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/jotizot.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_off0000624f.bin
eb19481407a0b3ca7d4dc4a147f23afb80353af95a47f8e3bcb87aefcdc19897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 5268 bytes
font_01_sfnt_off0000742b.bin
232eb63f01cd71fcf9eb7e4babbdc4da983c9460a12a350d54133e4d3787f4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 10364 bytes

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