Malicious PDF — malware analysis report

Static analysis result for SHA-256 b178c9fba2703f82…

MALICIOUS

PDF

46.2 KB Created: 2020-08-02 16:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d346e9440e09bc3769604a2558cd6a SHA-1: 06843142f838d47421d794cb0913ff8332353377 SHA-256: b178c9fba2703f82828679e8981cea98701364a699f584ccfef42e4ee1f62fd8
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'rollback android update samsung' and includes the malicious URL, suggesting a lure for users interested in that topic. The presence of a link farm indicates an attempt to manipulate search engine results or distribute malicious content through numerous seemingly benign-looking links.

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=rollback+android+update+samsung
    • http://files.wrangellsda.org/uploads/1/3/1/0/131070112/0dbe1e5.pdf
    • http://files.hbgfc.org/uploads/1/3/1/4/131452953/6021eb5a3493a01.pdf
    • http://files.knutielab.com/uploads/1/3/1/1/131163854/xitupu-kuminexewuwusuj-kemol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/gegafibojuwemut.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9300/files/medicare_benefit_policy_manual_chapter_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/82935966106.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/83006295397.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/43859460178.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/begufimikufawefap.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/wusamikuvofajixof.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/rizeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/mogokusase.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/sawasepojuvazilazife.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/45361766479.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e2.bin
2f4131b2f30938f63ee11e7b01473957013df1c664112f17b8ca54dac7daa209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E2 5488 bytes
font_01_sfnt_off00007b66.bin
cb4c8180347460a5078dd326aac9ceddcb5cbd8e5b2bde2a97db58c1e2e1a999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B66 10004 bytes
font_02_sfnt_off00009dab.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAB 4324 bytes

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