Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d420e74d763c33…

MALICIOUS

PDF

52.9 KB Created: 2020-08-17 18:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb80a6831fa3478100f2388acebbf6e4 SHA-1: 51239d0342bdc55e33eef9a1e5431b855948c653 SHA-256: c6d420e74d763c3312080c8402f120296705a7586d2f7f67cd6abd9118516f3b
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=vicon+english-+arabic+dictionary, which is the primary indicator of malicious intent. 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.cc/pify?keyword=vicon+english-+arabic+dictionary
    • http://rumuk.primandpropernews.com/uploads/1/3/1/0/131070476/4823597.pdf
    • http://files.littleleafflutestore.com/uploads/1/3/1/8/131859042/nubotogupaxila-zivuzobasutin-rusarok-kebuvo.pdf
    • http://files.calgaryburnsclub.com/uploads/1/3/1/4/131452838/pemakirodixaluxunu.pdf
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • http://files.totalresetweightloss.com/uploads/1/3/0/8/130814126/jowopadizitovexa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/7800391762.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/biwafoxomovotejalafumep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/swimming_pool_construction_details_dwg.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/4087901370.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/conjunction_exercise_for_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0450/7890/4984/files/important_days_download_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/ktea_3_technical_and_interpretive_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/47035516890.pdf
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/grow_up_king_lil_g_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/crazy_frog_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kesutuzijakakewinepubad.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/dejavokelumoselovas.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_off00005c6b.bin
8ecb0e7364c7d9ddc6a881470d4e8f082e2c4dab45cb94fe59dabe503e056adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6B 16820 bytes
font_01_sfnt_off000091e2.bin
7cc0e71bb1b8e1f1b60e0f60d8780fdb738529a33e10693f3616f69dc782d615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E2 5440 bytes
font_02_sfnt_off0000a459.bin
700c8cd3dc989fcaf4237508daea61dbb9386a435c4f30ccd363db9fdb310422		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA459 9976 bytes

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