Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f088df0aa592f2…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 07:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 882efc497e70a977efdd28d5245d422f SHA-1: 2cbc6fb8fcf93b4027c2e35d822d0cf9f0fb546e SHA-256: 13f088df0aa592f27dd7ef466d7f34a3f3e9b796012837ce9c0c3fd12f7fcb81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF files hosted on Shopify. However, one of the primary links directs to a known malicious redirector at 'ttraff.com'. This suggests a link farm or SEO poisoning attack designed to lure victims to malicious content. The ML classifier also strongly indicated maliciousness.

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=avocado+salad+recipes+pdf
    • http://junudal.flyawaykate.com/uploads/1/3/0/8/130874359/nuwozason.pdf
    • http://files.mariaburtonart.com/uploads/1/3/0/9/130969652/2cd2c399eea8b.pdf
    • http://files.goodshepherdogden.org/uploads/1/3/1/1/131164386/ff25b830930c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/23577109397.pdf
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/28472300765.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/vocabulary_list_for_ielts_general.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/lezamanalujerubovidow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vizinedidobirefeguj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/7674931989.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/billionaire_mindset.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/xukazifarujibasovugele.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/antonin_artaud_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/59040320466.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/ti_84_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/23915074712.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006402.bin
b09d8e9fec28cd7b80ca631e2131b67cc923a1c84d7225648c3a862d4f05dd05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 4800 bytes
font_01_sfnt_off00007456.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7456 1800 bytes
font_02_sfnt_off00007ce3.bin
9e2ac13a2cfe00d0f1f55e41c1c9131a26e0c46e97a37d55378bf1d749dac46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE3 10308 bytes
font_03_sfnt_off0000a026.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA026 4324 bytes

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