Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fdfae6e583a166…

MALICIOUS

PDF

39.6 KB Created: 2020-08-20 20:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6885cd1cbf0c1cc5182b293c96b27bc SHA-1: 0066b1f2bc1c65ac9d0ab9ded9fdab90e505517f SHA-256: 49fdfae6e583a166304d6ab6747088acd45c0576ee5c0423daca0e70063ab3ed
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at `https://ttraff.com/pify?keyword=roll+up+banner+psd`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of many Shopify links, some confirmed benign and others unknown, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=roll+up+banner+psd
    • http://ribese.rykerson.com/uploads/1/3/1/3/131397987/zasiwaxizele-kepugiwol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/devevefatogisetadan.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/56710557688.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2678/files/folanosuruj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/assessment_tools_examples.pdf
    • https://cdn.shopify.com/s/files/1/0450/7369/4870/files/600_essential_words_for_the_toeic_3rd_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/99994428412.pdf
    • https://cdn.shopify.com/s/files/1/0438/4191/2997/files/51364543792.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/46799808910.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/13943209250.pdf
    • https://cdn.shopify.com/s/files/1/0436/0303/4276/files/orange_guon_stone.pdf
    • https://cdn.shopify.com/s/files/1/0448/5795/0370/files/lista_de_bacterias_gram_negativas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/kol_berama_boro_park.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d5b.bin
bbcef342bb3118e4d591279c806d9e4552cc70f83b2d1af041d07ac8c08e17b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5B 5100 bytes
font_01_sfnt_off00006eb0.bin
13e33ab8ca7f88ec27a433b554a3471cbebb1d691926b7a2433f885818fb2ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB0 10516 bytes