Malicious PDF — malware analysis report

Static analysis result for SHA-256 318acb27c1cc0f52…

MALICIOUS

PDF

50.9 KB Created: 2020-07-31 01:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5afae5efa3285d2d56f37d22c3dfec SHA-1: 2f2b0cb53347d0f087cb0259b6c1cba03d9c7c7c SHA-256: 318acb27c1cc0f52232266935b59aca24cc6e4699165876707d71944f1c034d6
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for 'calculus 1 problems pdf'. The presence of numerous external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. The primary malicious IOC is the redirector URL.

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=calculus+1+problems+pdf
    • http://files.pop-wuj.org/uploads/1/3/0/8/130874284/buriraxusa_lixogej_sufenut.pdf
    • http://files.serviportspain.com/uploads/1/3/0/7/130776489/zonobanoputi-lasusitexez-fatubeb.pdf
    • http://files.carlingtonchaplaincy.com/uploads/1/3/1/6/131606121/4317344.pdf
    • http://files.crotonlibrary.org/uploads/1/3/1/3/131383480/sedidakavurabafi.pdf
    • http://files.elcazadormex.com/uploads/1/3/2/6/132683334/8515a97b2d2.pdf
    • http://files.carlingtonchap
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/jukexakejag.pdf
    • https://cdn.shopify.com/s/files/1/0436/9688/1814/files/tomiwafurexevu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/wodadowabepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/kupefub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/48276692534.pdf
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/fejik.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/wupugofotaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/34660991441.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/54518070188.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/fisunufiwina.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/minatewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/sugalilakegumiwokifenad.pdf
    • https://cdn.shopify.com/s/files/1/0440/6552/1814/files/87231446733.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/2167709993.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/83905530620.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_off00008b84.bin
d8ccb62caa89f689c2de009ac568fa676a6ae17739c8a28831e3ca0343eaac66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B84 5164 bytes
font_01_sfnt_off00009d12.bin
50d198616f852fa95fe4bfaf774a5c2c24b2b907fb180615e90d9d5ab6693b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D12 9784 bytes

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