Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09ca774d254e4d8…

MALICIOUS

PDF

55.8 KB Created: 2020-08-06 23:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6a67513f70358c866854cd553429b52 SHA-1: 30879737fc5a0c50edc18f206723894c5b8ec829 SHA-256: a09ca774d254e4d888844cd8b69c15e300e14cc77a803c1002ae88a4f2874e74
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to deliver a payload. The document body, though heavily obfuscated, contains the text 'Buprenorfina en infusion pdf', suggesting a lure related to medical information. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the ultimate destination. No scripts were extracted, but the primary attack vector appears to be the 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.com/pify?keyword=buprenorfina+en+infusion+pdf
    • http://kazuvi.edgewoodfarms.net/uploads/1/3/0/8/130813420/masiji_vovirowerula_keturovow_kebidedelapor.pdf
    • http://xemoniku.thejuraguy.com/uploads/1/3/1/3/131383544/b0125e39693.pdf
    • http://files.clubdoomcomics.com/uploads/1/3/1/4/131483154/gifegajoxeri-wokalamitad.pdf
    • http://lamatu.santamonicaquiltguild.org/uploads/1/3/2/8/132814930/65de7e678b.pdf
    • http://files.jindabyneyabbies.com.au/uploads/1/3/1/6/131606798/zetut.pdf
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/14818754813.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/19026253700.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/jipogakefipixunuvap.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/fivivatate.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/sipopugexopezegajewav.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/340352495.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/john_wick_2_subtitle.pdf
    • https://cdn.shopify.com/s/files/1/0436/5461/1102/files/35403257819.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/14547961784.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/6617556314.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/fifa_15_contract_expiry.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/dawagetavejevebugozirafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/36564453442.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_off00009373.bin
5893a3bb5bd46f53be453cc438e29240fe779ad20d8fc4f2269916f2f0375a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9373 5052 bytes
font_01_sfnt_off0000a4b2.bin
d3f569437866e1b4a3e1ceb1b8514af1097db511008531d9f151be1b8e85aab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B2 14452 bytes

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