Malicious PDF — malware analysis report

Static analysis result for SHA-256 019e6cf3ec9d69e0…

MALICIOUS

PDF

46.3 KB Created: 2020-08-21 11:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db82b88e16714432733c4a82b6b623e9 SHA-1: 92f77457a76e84cbc5786fbc16800ae57cecfe4a SHA-256: 019e6cf3ec9d69e0fc3501ae0d40c8526b690845ec210c6766ff8734a1e0971a
154 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, but one critical link directs to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains the text 'little alchemy cheats sheet' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=little+alchemy+cheats+sheet
    • http://mekubo.rebeccaelbaum.com/uploads/1/3/2/3/132303219/kuwivuxemapudaki.pdf
    • http://kixuvama.downfieldgolfclub.co.uk/uploads/1/3/1/4/131437914/e9372df.pdf
    • http://files.markusluxeent.com/uploads/1/3/1/4/131406781/3931697.pdf
    • http://keleteru.childproofingcolorado.com/uploads/1/3/0/8/130874488/dumes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/xumusetemivevituf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/nebirupuderijifepoger.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/puneza.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/mosesidozadegumejawifenuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/56084731650.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/puwilasovejununibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/83380768763.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/32118300159.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/60696981624.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/ttd_brahmotsavam_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/matidorozovovezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/29046851973.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2637/files/90721712029.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007837.bin
be3bd221297adc4aa09d66c80d284d547129e36f80537656367a09ca4e4829fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 4984 bytes
font_01_sfnt_off0000890f.bin
51ea82c680a8f03006b338207f675b11bb7aef50ff218de30d16130c5eb840ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890F 10556 bytes

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