Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c847e58b58a7ab…

MALICIOUS

PDF

55.6 KB Created: 2020-08-19 19:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e497c91c01080011901dacc399c10e2d SHA-1: e542b1335ddfd58071a04cbf5004436974ecad6b SHA-256: b3c847e58b58a7abb99bfa293d12a3a21c8be2a6ec74754bcea9c406f1d8fb01
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with the primary heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The ML classifier also strongly indicated maliciousness. The presence of numerous links, including those pointing to Shopify, suggests an attempt to manipulate search engine results or create a link farm to obscure the malicious redirector.

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=aosp+extended+lenovo+a6000
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdf
    • http://sowilezo.florosstylianoumotors.com/uploads/1/3/1/3/131398003/0154a10b.pdf
    • http://boputu.alloutafrica.org/uploads/1/3/0/8/130874330/4065325.pdf
    • http://zepev.mtcwatercooler.org/uploads/1/3/1/3/131383613/94fccc.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/zavasufonebajavodulowat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/7_day_weekly_schedule_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/19479783089.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/vozifedotubitunizubini.pdf
    • https://cdn.shopify.com/s/files/1/0435/9372/8158/files/rules_cynthia_lord_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/afunika_piki_piki_skirt_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4274/1143/files/roluluvis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/87011558578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/somaxul.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/piromupupovowuwixixani.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007890.bin
3fbd87febe70ccbca545c83022e44a2ba1b4306f2428ceee9c8f0975c5893633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 5268 bytes
font_01_sfnt_off00008a8b.bin
4221cd0b28562139876a1ca53c3673a924719946709b3ee75f9c69755e466720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8B 2900 bytes
font_02_sfnt_off0000957a.bin
03748f79be7211caa86ecefccf3bb7f6d9952c4dd6a57e5a9e27007f18ba476b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957A 10924 bytes
font_03_sfnt_off0000ba97.bin
dd1bc5728cf11c3cf618b3fa20fa9f301997e6c156e55213d084fcc2cf421742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA97 16704 bytes

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