Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80876beb9183e98…

MALICIOUS

PDF

71.2 KB Created: 2020-08-08 01:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b7f5b21262218cdda30bf2ed07e041 SHA-1: 5a65c467498ba0153f1391dcbe13ed1e92a56034 SHA-256: f80876beb9183e98d6e47c29ee3d5ba23855d9b79083e68465ed98e7bd584fa5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users into clicking it. The presence of a link farm further supports the malicious intent.

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=le+moringa+et+ses+vertus+pdf
    • http://files.shoggothkinetics.com/uploads/1/3/1/0/131070488/b3f5a60e.pdf
    • http://files.rustybarnblog.com/uploads/1/3/1/4/131406827/feniv.pdf
    • http://lusoxato.johnandkarahood.com/uploads/1/3/1/0/131070872/1710142.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/bachianas_5_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/55631165352.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/8863476011.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/87512242547.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/75916430645.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/amor_liquido_bauman_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/74340882.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/51419382534.pdf
    • https://cdn.shopify.com/s/files/1/0441/3489/1672/files/kannada_janapada_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0808/files/fulipegolamexogagovet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/61526983683.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/lewadolulijugivet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/65987075871.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/vocabulary_words_with_urdu_meaning_and_sentences.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009885.bin
2a15c6a2b4f096968a715b4d915c23001e35a13b156ae1ea1cb6bbfa911318c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9885 5328 bytes
font_01_sfnt_off0000aa94.bin
8edb7b1e1c3e00a98b7c08d5c85041c26c5bc3bf7e9f08644a1a3878957d4831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA94 8772 bytes
font_02_sfnt_off0000c825.bin
a929c0d6e668b31ba20873248d26aa6c66810d6d4892d02566982bee654cee1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 15280 bytes
font_03_sfnt_off0000f5d0.bin
6aba2a0ee81482b2956b39fc10e3ec2ec13bca26fce3fbe8c7401fd66fd3592c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16872 bytes

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