Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c6e33873eb6cc4…

MALICIOUS

PDF

36.6 KB Created: 2020-08-11 21:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b7894df04166c656a68045bba78ab5 SHA-1: f81ca400da16143b64094716f684556b512d0b4b SHA-256: a6c6e33873eb6cc4d055ac0dfc349501ac105d1643739c73050b89711806a43e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains text related to job interviews and the malicious URL. This suggests a social engineering attempt to trick users into visiting a malicious site, likely for further exploitation or credential harvesting.

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=job+interview+vocabulary+worksheet+pdf
    • http://files.sparklingimagedesigns.com/uploads/1/3/0/7/130776730/feedd949.pdf
    • http://files.arkansasyouthconference.org/uploads/1/3/1/6/131637919/6364220.pdf
    • http://files.therealmcdenver.com/uploads/1/3/2/6/132682882/f7a0013d13.pdf
    • http://files.awakeningcenter.net/uploads/1/3/0/7/130738621/lujuzerevuvoni-kudipede.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3192/files/92438228863.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/sharjah_airport_free_zone_rules_and_regulations.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/31848335724.pdf
    • https://cdn.shopify.com/s/files/1/0435/1364/3167/files/76535811151.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/joxanakekuravobofagejokod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/23216225562.pdf
    • https://cdn.shopify.com/s/files/1/0437/9194/1781/files/administracion_financiera_block.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7900/files/advantages_and_disadvantages_of_non_probability_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/believe_in_yourself_you_are_amazing_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/the_unforgiven_lyrics_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/8020/2905/files/vunusajuvuparowipuvi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/32068032668.pdf
    • https://cdn.shopify.com/s/files/1/0432/6545/8336/files/autosar_diagnostic_stack.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/kowodujutetotivejiv.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_off00004eef.bin
ac93ec504f6e1eba154f44d93eb0c0d4dd3ec4bbff2ad6d98d75ab52246b85df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEF 5692 bytes
font_01_sfnt_off0000625b.bin
bdf3065853655d9e04ef85fd140e5acb0e8a19cd053849088d624846d81d8071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 10132 bytes

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