Malicious PDF — malware analysis report

Static analysis result for SHA-256 553e7cd214047a21…

MALICIOUS

PDF

52.4 KB Created: 2020-08-21 20:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f942df676d8095a4b24f5f14671365cb SHA-1: 447c6e7510c531dda84ec6c1b846c835fabe1467 SHA-256: 553e7cd214047a2187de7a9e4eab4f06691ab2c7398a48d49cfa51314bb920df
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, designed to appear as a link farm. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=acido+glutamico+para+que+sirve+pdf', which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains this URL and references 'wkhtmltopdf', suggesting it was generated programmatically to host these links. No scripts were extracted from this sample.

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=acido+glutamico+para+que+sirve+pdf
    • http://files.westsydneyparanormal.org/uploads/1/3/2/6/132682295/jebitonitesox.pdf
    • http://files.stbrigidsschool.net/uploads/1/3/1/8/131872087/fufosum-muvepuvid-pobadesitemij.pdf
    • http://pavixugi.sequimveritatis.org/uploads/1/3/1/4/131453133/3870502.pdf
    • http://files.odeceyc.org/uploads/1/3/0/7/130739833/2bd843de77bd74c.pdf
    • http://ziwezix.eloquentslt.com/uploads/1/3/1/4/131437871/d4742f5.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/muderav.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/australasian_lawyer_innovative_firms_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/vusipagosupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/kagemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7461/files/susar_reporting_pharmacovigilance.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/48224772378.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1125/files/85900315228.pdf
    • https://cdn.shopify.com/s/files/1/0430/7179/9449/files/prl_impact_factor.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/bisuzurexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/xopulagoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/89254688897.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/14569200274.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_off000072f1.bin
a57b1fdcfb5f62145b1ec78943b26eaf521683585fefd9ddd306b094bcc720df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F1 5428 bytes
font_01_sfnt_off00008569.bin
d8b130204ec1422d4021e3588d7b30e3ca1f3487f59137f14dd1b887eb4aac23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8569 15424 bytes
font_02_sfnt_off0000b4c2.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 4324 bytes

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