Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b88a4c2a0ec024…

MALICIOUS

PDF

50.8 KB Created: 2020-07-23 04:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db13aecbd649c878d476a0ad42247a47 SHA-1: 26f0893da42f74222a02325ef4403cae7467df68 SHA-256: b7b88a4c2a0ec0241b370d12ada45aa78e9e3015aa623d119fd1e6d3f1fb4d13
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'Southwest Airlines case study'. The presence of numerous external PDF links, many hosted on Shopify, further supports a link farm or redirection strategy. The primary IOC is the malicious redirector URL.

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=southwest+airlines+case+study+pdf
    • http://files.travelinforlove.com/uploads/1/3/1/6/131606366/594458.pdf
    • http://files.breezyshoresmininubians.com/uploads/1/3/1/8/131871744/9615312.pdf
    • http://files.utile-it.com/uploads/1/3/0/7/130775823/255f1ffe959a1.pdf
    • https://lojakufobako.f
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/37627605698.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/88553923236.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/rijabolowipe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/sowulasajukoj.pdf
    • https://zezupid.files.wordpress.com/2020/06/63870330417.pdf
    • https://lojakufobako.files.wordpress.com/2020/07/79649663904.pdf
    • https://zapikavosofi.files.wordpress.com/2020/06/90845409999.pdf
    • https://sigegajif.files.wordpress.com/2020/06/pinasadilerimidobusu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/wafox.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/27460085829.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/rogujemakepolironexoxafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/4053599924.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/28433716742.pdf
    • https://cdn.shopify.com/s/files/1/0435/3081/3592/files/vovikarogotuzaxutifaxus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/75005202400.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_off000087ad.bin
72d97f16e30a01fd83b4e3bc1e9dbb0f2316fcabc70ab2807d1d5170c66cb19c
pdf-font-stream PDF embedded font (sfnt) at offset 0x87AD 5424 bytes
font_01_sfnt_off00009a29.bin
2cf49dc162a54f0988aeda418cbb24410c56820665b5945aab6ce00f81a388d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A29 10304 bytes