Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d803928f3b0682…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 13:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c491fe76ee053ef5c3ab22a48228bb99 SHA-1: b9baf46206939e3dac766affc88b1220a8007629 SHA-256: a7d803928f3b0682f4487104b8b8daac26bb7196fe39f9d0279c8685d7b0d570
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=affidavit%20of%20service%20format%20pdf'. Another critical heuristic identified a PDF link farm hosted on Shopify, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links points to a delivery mechanism designed to redirect users to 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/wb?keyword=affidavit%20of%20service%20format%20pdf
    • http://files.stevethenaturopath.com/uploads/1/3/1/8/131857112/vuzeparomepulukej.pdf
    • http://files.gowithjofitness.com/uploads/1/3/1/4/131409128/puxogu.pdf
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • http://files.belovedcommunitysp.org/uploads/1/3/1/6/131606256/jusulipaterij-wiluzazivu.pdf
    • http://files.nativetales.com/uploads/1/3/0/7/130775942/b90bae542e.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5916/files/kasisirejune.pdf
    • https://cdn.shopify.com/s/files/1/0434/6344/2598/files/30349050420.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/90160790406.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/61979327200.pdf
    • https://cdn.shopify.com/s/files/1/0439/0469/6472/files/elements_of_power_electronics_krein_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/ruvefoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/63209718270.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/zifewewebuxiburekim.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/59751534116.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/xuwanav.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/29202058531.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/xuferorubeditegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/metifuratamesaxekuwaxoso.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_off000065c2.bin
e08e6d96ea14f9a3ec79b3315354102dd7025107fb8ce21201ea07d241ef303b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 5316 bytes
font_01_sfnt_off000077cf.bin
e2ec92bce63d0a98368d2dee12ee75fc479eb6ef92a84e7389a9e8b730da1065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CF 9824 bytes

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