Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a7e91631959404…

MALICIOUS

PDF

144.1 KB Created: 2020-08-10 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b8bd340cd2390a6d8f75a05f6042be SHA-1: f78f02f54536e1ea0396cd63a068e97c1cca7188 SHA-256: d8a7e9163195940407bb98b8a17795babf739bea3dd11484eb2e8aedf239faec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'bbc learning english listening pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=bbc+learning+english+listening+pdf
    • http://files.shonkalay.com/uploads/1/3/1/4/131438629/6575557.pdf
    • http://files.bioremediationaquaculture.com/uploads/1/3/2/7/132740633/gapabasotiroxut.pdf
    • http://xinoli.landofmadmen.com/uploads/1/3/0/8/130813765/puzok.pdf
    • http://naxekap.inaheadofthecurve.com/uploads/1/3/1/1/131164250/3987683.pdf
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/45983113686.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/carmilla_castellano.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/jajababexovete.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/datujon.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/susamimopudifilisesunoron.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/rearrange_pages_in_adobe_reader_x.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/jelikazilugeminezizabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/guvunetut.pdf
    • https://cdn.shopify.com/s/files/1/0428/1368/5927/files/soxuxapopofigij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/is_david_archuleta_gay.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/tisitetemobuzuli.pdf
    • https://cdn.shopify.com/s/files/1/0432/5975/6708/files/20140770209.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/big_ideas_simply_explained_mythology.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_off0001eda4.bin
bfd1bce211e525fdbff6aa77c80a40be844c93b0d129d613ffb5c078b6630628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDA4 5284 bytes
font_01_sfnt_off0001ff88.bin
bab229342ad5cdb5d475672329e128000c058051b719aab0640147f3d9a6c690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF88 10668 bytes
font_02_sfnt_off000223e7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x223E7 4324 bytes

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