Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1495ccb0d6cb338…

MALICIOUS

PDF

100.5 KB Created: 2020-08-11 06:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57e43c78a9969f6fae1d057746023f1 SHA-1: b8bfd22027b31f2f087104239efc2c57e8780793 SHA-256: e1495ccb0d6cb338d7145f51644d556efeb0f3bda40271382ce975bd5af9601a
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of numerous external links, including a redirector to the known malicious domain 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness. The attack pattern involves a link farm designed to direct users to potentially harmful content.

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=apprendre+chinois+debutant+pdf
    • http://fawojil.holyspiritfarmhorsesanctuary.com/uploads/1/3/2/7/132710657/9887695.pdf
    • http://files.theadvicelady.com/uploads/1/3/1/6/131637136/xitakenub-gaxiwojirag-levizafujakumax-wugerozu.pdf
    • http://sozetep.utkalphachiomega.com/uploads/1/3/1/8/131858540/tukidiretajisa_sojera_regawarodi.pdf
    • http://files.aymank.com/uploads/1/3/1/6/131606789/855ccfc3.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/xogaluxapor.pdf
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/ffmpeg_wav_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0430/9234/4999/files/32826805393.pdf
    • https://cdn.shopify.com/s/files/1/0432/8987/0491/files/fudonazegozowoxepisixom.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/domagoxesijawejubagebud.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/titunasejopovubaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/budget_speech_2020_19_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0122/files/50_cent_candy_shop_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/4375/6954/files/vorivizaxiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/paloroxasejepaloxet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/pipijuxoseror.pdf
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/nuvovadapudevamipitavam.pdf
    • https://cdn.shopify.com/s/files/1/0437/4000/4501/files/brasseler_usa_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/68658951087.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
stream_004_off0000de07.bin
1c62306ab6873f976449ae6065d4e5d111ec6a77a892e6a8c1c495d0413c6854		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE07 34536 bytes
font_01_sfnt_off0001484d.bin
e66377aad00a2e82d9a687d96f7d2c14baed178827cc5b0efea292973e2853e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1484D 5340 bytes
font_02_sfnt_off00015a5b.bin
ae698b23b27dca15d65abc37f8cd790ecebec53266d5d6212714a022b2e1cab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5B 13344 bytes

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