Malicious PDF — malware analysis report

Static analysis result for SHA-256 3438d998117e086a…

MALICIOUS

PDF

50.8 KB Created: 2020-08-10 05:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cc64d816df30959fc05a75c3f0a20ea SHA-1: b5000ad83414601ec6eed27275fec38eedc302ef SHA-256: 3438d998117e086aca8b21711dbf9fa8a69a9cfe67f830c9fa4fb846fd580de7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=hornos+de+atmosfera+controlada+pdf', indicating a phishing or malware distribution lure. The ML classifier also strongly flagged this PDF as malicious.

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=hornos+de+atmosfera+controlada+pdf
    • http://files.touchvt.com/uploads/1/3/1/3/131380504/de07a13a9.pdf
    • http://files.tammylynnhenderson.com/uploads/1/3/0/8/130874683/malojel.pdf
    • http://files.livinweedy.net/uploads/1/3/1/6/131637168/zedonijozekawot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/damikidatipudej.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/tinkers_construct_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/lodawijoluvilalunusaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/dogizosatuxinewipinisaxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6738/2687/files/38852647643.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/bricks_and_mortar_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/58351483106.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/wejubiwo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000807a.bin
4af7b356f0c00038396da91fc56fa7175adcd1921255e87014e37e48328b688a
pdf-font-stream PDF embedded font (sfnt) at offset 0x807A 5260 bytes
font_01_sfnt_off0000924b.bin
4edfbc5aa701d659f7efd45fb946ae881a3857ab62a594b87f09db20412ddb4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x924B 13472 bytes