Malicious PDF — malware analysis report

Static analysis result for SHA-256 678cfb475e44ffc3…

MALICIOUS

PDF

50.6 KB Created: 2020-08-25 12:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e5e994fbce552f95083e89508e76168 SHA-1: 65aee3abd85147acf7d389361d76c48b1402cc0f SHA-256: 678cfb475e44ffc3bc694f7d242fbec787730f8acc63611fa7f34a717a1c683e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=filmic+pro+camera+apkpure, suggests a potential lure related to software or applications. The document body, though heavily obfuscated, also contains this URL and other PDF links, indicating an attempt to direct users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=filmic+pro+camera+apkpure
    • http://vonadalo.disruptivenewyork.com/uploads/1/3/2/7/132710712/mipet.pdf
    • http://mugelogag.wildparrotsupclose.com/uploads/1/3/1/4/131410685/pofipumefixixu-porezusuxugadol.pdf
    • http://files.filipinoprivatedutynurseonline.com/uploads/1/3/1/4/131453595/9e38c0eb707b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3227/9200/files/84521085505.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/76931285093.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/meluvogivapalulam.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/jevil.pdf
    • https://cdn.shopify.com/s/files/1/0439/7685/1614/files/48430083272.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/lozetodajugelarudaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/mumidugu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/79023125904.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.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_off0000847e.bin
47c304ac5b62c35311c7705c43a137422b6c877460c43313ae4b95f6b55f6b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x847E 4920 bytes
font_01_sfnt_off0000951d.bin
fc185f85467ec87a44568d0a473a53a9ecdcc391375668e366a1f9835244a4f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x951D 13024 bytes

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