Malicious PDF — malware analysis report

Static analysis result for SHA-256 a989929ab5966b2a…

MALICIOUS

PDF

47.8 KB Created: 2020-07-22 15:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28131b71ec9eb64cd17d810fd5d10241 SHA-1: 0258ae950336e06c411eb6f7f364e4a14b24978a SHA-256: a989929ab5966b2a8bb9be8c4b064371d9b0b2c17d61e0b462e753061ee1d71d
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a redirector link to a known malicious domain and a link farm designed for SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The embedded URLs, particularly the one pointing to 'ttraff.ru', are likely used to redirect users to phishing or malware download sites, disguised by the 'September 2019 calendar free pdf' lure.

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/wb?keyword=september%202019%20calendar%20free%20pdf
    • http://files.kariemsaleh.de/uploads/1/3/1/3/131382243/linukagane.pdf
    • http://files.ecuadorforestofclouds.com/uploads/1/3/1/1/131163683/dafovonagasomo_vugunozineve_sonemerefunewat_riziju.pdf
    • http://files.forumartspace.com/uploads/1/3/0/7/130740213/tolanudapej_zuvojadadas_fepolumitijapi.pdf
    • http://files.myleshopper.com/uploads/1/3/1/4/131452735/lurefusijebokewu.pdf
    • http://files.eastprospectparade.org/uploads/1/3/1/3/131379117/fepukelo_lukafikogo_fizewezex_dijadixux.pdf
    • http://files.for
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/mudurawebopumiruwule.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4578/files/waxewevuxukadog.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/gipobibixanixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/kujurezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52299098946.pdf
    • https://buluzoti.files.wordpress.com/2020/06/woxid.pdf
    • https://sataleli.files.wordpress.com/2020/07/73470836096.pdf
    • https://suwaboto.files.wordpress.com/2020/07/fezelexegorurumipowuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/sapedovetepub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/razoviserobibes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sebifoxof.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/58553061800.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bipifapokuwegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/sezamebapaxuton.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/zipeza.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/25125944169.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_off00007b4d.bin
b751ac7ae72b1a041b74b4885dad2d78e5a5c980ecefe96e4ce17a18140a7b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4D 5476 bytes
font_01_sfnt_off00008dc6.bin
33a5c2599d2dc90f56c6e5990deb3bd16f3ef8aa27253cc9fc447a4f60a198b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC6 10584 bytes

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