Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feb9bb3e7b408c4…

MALICIOUS

PDF

50.1 KB Created: 2020-08-11 22:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c99b2fb1b8f2c3f6ded466d306d549 SHA-1: 76052ea82b14bb3e580dcf2b32e3528b10624bd7 SHA-256: 1feb9bb3e7b408c4a61c2eac1c40eecb1b8382462090fa1f17ea328ec582a458
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=sustainable+building+design+for+tropical+climates+pdf'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the final malicious destination. The document body contains garbled text and the malicious URL, further supporting 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=sustainable+building+design+for+tropical+climates+pdf
    • http://files.maydaystudio.com/uploads/1/3/1/6/131637546/162127.pdf
    • http://files.mysecretmuse.services/uploads/1/3/0/7/130776099/vusetagid.pdf
    • http://xavaf.nitinagrawal.com/uploads/1/3/2/6/132695278/bufotamelikinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/babuzetudovolu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/46553808250.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/actuators_and_sensors.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/43866571628.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/viguz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/fadekurefojegijuwasez.pdf
    • https://cdn.shopify.com/s/files/1/0438/1851/6637/files/73555579004.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/moloxox.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/62022364710.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/36625391902.pdf
    • https://cdn.shopify.com/s/files/1/0432/4694/4416/files/65200106388.pdf
    • https://cdn.shopify.com/s/files/1/0434/6095/2229/files/keto_food_list_with_carb_count.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/davukikavabujo.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_off0000849a.bin
0fbcc54d95a796bd1ce61634261df6602e748e41514ddd366e7b84a5551db3b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849A 5716 bytes
font_01_sfnt_off000097e9.bin
189814743f7ec9f81ea79244bf1e818a28f52b261cf1430af79d37efd89c8220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E9 10328 bytes

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